FM21L16

FM21L16 RAMTRON | Alldatasheet

Document overview

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• PDF pages: 14

Technical content

Features

2Mbit Ferroelectric Nonvolatile RAM

• Organized as 128Kx16
• Configurable as 256Kx8 Using /UB, /LB
• 1014 Read/Write Cycles
• NoDelay™ Writes
• Page Mode Operation to 40MHz
• Advanced High-Reliability Ferroelectric Process SRAM Compatible
• Industry Std. 128Kx16 SRAM Pinout
• 60 ns Access Time, 110 ns Cycle Time Advanced Features
• Low V DD Monitor Protects Memory against Inadvertent Writes
• Software Programmable Block Write Protect Superior to Battery-backed SRAM Modules
• No Battery Concerns
• Monolithic Reliability
• True Surface Mount Solution, No Rework Steps
• Superior for Moisture, Shock, and Vibration Low Power Operation
• 2.7V – 3.6V Power Supply
• Low Current Mode (5µA) using ZZ pin
• 18 mA Active Current Industry Standard Configuration
• Industrial Temperature -40° C to +85° C
• 44-pin “Green”/RoHS TSOP-II package

Description

The FM21L16 is a 128Kx16 nonvolatile memory that reads and writes like a standard SRAM. A ferroelectric random access memory or FRAM is nonvolatile, which means that data is retained after power is removed. It provides data retention for over 10 years while eliminating the reliability concerns, functional disadvantages, and system design complexities of battery-backed SRAM (BBSRAM). Fast write timing and high write endurance make FRAM superior to other types of memory. In-system operation of the FM21L16 is very similar to other RAM devices and can be used as a drop-in replacement for standard SRAM. Read and write cycles may be triggered by /CE or simply by changing the address. The FRAM memory is nonvolatile due to its unique ferroelectric memory process. These features make the FM21L16 ideal for nonvolatile memory applications requiring frequent or rapid writes in the form of an SRAM. The FM21L16 includes a low voltage monitor that blocks access to the memory array when V DD drops below a critical threshold. The memory is protected against an inadvertent access and data corruption under this condition. The device also features software-controlled write protection. The memory array is divided into 8 uniform blocks, each of which can be individually write protected. The device is available in a 400 mil 44-pin TSOP-II surface mount package. Device specifications are guaranteed over industrial temperature range –40°C to +85°C. Pin Configuration

Ordering Information

FM21L16-60-TG 60 ns access, 44-pin “Green”/RoHS TSOP-II

Figure 1. Block Diagram A(16:0) Input Address inputs: The 17 address lines select one of 131,072 words in the FRAM array. low and /ZZ is high. The entire address is latched internally on the falling edge of /CE. latches a new column address for page mode write cycles. data is available. Deasserting /OE high tri-states the DQ pins. DQ(15:0) I/O Data: 16-bit bi-directional data bus for accessing the FRAM array.

Rev. 1.0 Sept. 2007 Page 3 of 14 Functional Truth Table 1,2 /CE /WE A(16:2) A(1:0) /ZZ Operation X X X X L Sleep Mode H X X X H Standby/Idle ↓ H V V H Read L H No Change Change H Page Mode Read L H Change V H Random Read ↓ L V V H /CE-Controlled Write L ↓ V V H /WE-Controlled Write 2 L ↓ No Change V H Page Mode Write 3 ↑ X X X H Starts Precharge Notes: 1) H=Logic High, L=Logic Low, V=Valid Data, X=Don’t Care. 2) /WE-controlled write cycle begins as a Read cycle and A(16:2) is latched then. 3) Addresses A(1:0) must remain stable for at least 10 ns during page mode operation. 4) For write cycles, data-in is latched on the rising edge of /CE or /WE, whichever comes first. Byte Select Truth Table /OE /LB /UB Operation H X X X H H Read; Outputs Disabled H L Read; DQ(7:0) Hi-Z L H Read; DQ(15:8) Hi-Z L L L Read H L Write; Mask DQ(7:0) L H Write; Mask DQ(15:8) X L L Write Simplified Sleep/Standby State Diagram

Rev. 1.0 Sept. 2007 Page 4 of 14 Overview The FM21L16 is a wordwide FRAM memory logically organized as 131,072 x 16 and accessed using an industry standard parallel interface. All data written to the part is immediately nonvolatile with no delay. The device offers page mode operation which provides higher speed access to addresses within a page (row). An access to a different page requires that either /CE transitions low or the upper address A(16:2) changes. Memory Operation Users access 131,072 memory locations, each with 16 data bits through a parallel interface. The FRAM array is organized as 8 blocks each having 4096 rows. Each row has 4 column locations, which allows fast access in page mode operation. Once an initial address has been latched by the falling edge of /CE, subsequent column locations may be accessed without the need to toggle /CE. When /CE is deasserted high, a precharge operation begins. Writes occur immediately at the end of the access with no delay. The /WE pin must be toggled for each write operation. The write data is stored in the nonvolatile memory array immediately, which is a feature unique to FRAM called NoDelay TM writes. Read Operation A read operation begins on the falling edge of /CE. The falling edge of /CE causes the address to be latched and starts a memory read cycle if /WE is high. Data becomes available on the bus after the access time has been satisfied. Once the address has been latched and the access completed, a new access to a random location (different row) may begin while /CE is still low. The minimum cycle time for random addresses is t RC. Note that unlike SRAMs, the FM21L16’s /CE-initiated access time is faster than the address cycle time. The FM21L16 will drive the data bus when /OE and at least one of the byte enables (/UB, /LB) is asserted low. The upper data byte is driven when /UB is low, and the lower data byte is driven when /LB is low. If /OE is asserted after the memory access time has been satisfied, the data bus will be driven with valid data. If /OE is asserted prior to completion of the memory access, the data bus will not be driven until valid data is available. This feature minimizes supply current in the system by eliminating transients caused by invalid data being driven onto the bus. When /OE is deasserted high, the data bus will remain in a high-Z state. Write Operation Writes occur in the FM21L16 in the same time interval as reads. The FM21L16 supports both /CE- and /WE-controlled write cycles. In both cases, the address A(16:2) is latched on the falling edge of /CE. In a /CE-controlled write, the /WE signal is asserted prior to beginning the memory cycle. That is, /WE is low when /CE falls. In this case, the device begins the memory cycle as a write. The FM21L16 will not drive the data bus regardless of the state of /OE as long as /WE is low. Input data must be valid when /CE is deasserted high. In a /WE-controlled write, the memory cycle begins on the falling edge of /CE. The /WE signal falls some time later. Therefore, the memory cycle begins as a read. The data bus will be driven if /OE is low, however it will hi-Z once /WE is asserted low. The /CE- and /WE-controlled write timing cases are shown in the Electrical Specifications section. Write access to the array begins on the falling edge of /WE after the memory cycle is initiated. The write access terminates on the rising edge of /WE or /CE, whichever comes first. A valid write operation requires the user to meet the access time specification prior to deasserting /WE or /CE. Data setup time indicates the interval during which data cannot change prior to the end of the write access (rising edge of /WE or /CE). Unlike other truly nonvolatile memory technologies, there is no write delay with FRAM. Since the read and write access times of the underlying memory are the same, the user experiences no delay through the bus. The entire memory operation occurs in a single bus cycle. Data polling, a technique used with EEPROMs to determine if a write is complete, is unnecessary. Page Mode Operation The FRAM array is organized as 8 blocks each having 4096 rows. Each row has 4 column address locations. Address inputs A(1:0) define the column address to be accessed. An access can start on any column address, and other column locations may be accessed without the need to toggle the /CE pin. For fast access reads, once the first data byte is driven onto the bus, the column address inputs A(1:0) may be changed to a new value. A new data byte is then driven to the DQ pins no later than t AAP, which is less than half the initial read access time. For fast access writes, the first write pulse defines the first write access. While /CE is low, a subsequent write pulse

sequence invokes the write protection mode. specifies the desired protection state of each sector. completed, the next operation must be a write cycle. address of 00000h must precede 12555h. Figure 2. The write-protect settings are nonvolatile. The factory default: all blocks are unprotected.

Figure 2. Write-Protect State Machine

Rev. 1.0 Sept. 2007 Page 8 of 14 Electrical Specifications Absolute Maximum Ratings Symbol Description Ratings VDD Power Supply Voltage with respect to V SS -1.0V to +4.5V VIN Voltage on any signal pin with respect to V SS -1.0V to +4.5V and VIN < VDD+1V TSTG Storage Temperature -55°C to +125°C TLEAD Lead Temperature (Soldering, 10 seconds) 300° C Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only, and the functional operation of the device at these or any other conditions above those listed in the operational section of this specification is not implied. Exposure to absolute maximum ratings conditions for extended periods may affect device reliabilit y. DC Operating Conditions (TA = -40° C to + 85° C, VDD = 2.7V to 3.6V unless otherwise specified) Symbol Parameter Min Typ Max Units Notes VDD Power Supply 2.7 3.3 3.6 V IDD Power Supply Current - 18 mA 1 ISB Standby Current @ TA = 25°C @ TA = 85°C 150 270 µA µA IZZ Sleep Mode Current @ TA = 25°C @ TA = 85°C µA µA VTP V DD Trip Point to Block Accesses 2.2 - 2.6 V 4 ILI Input Leakage Current ±1 µA ILO Output Leakage Current ±1 µA VIH Input High Voltage 2.2 V DD + 0.3 V VIL Input Low Voltage -0.3 0.6 V VOH1 Output High Voltage ( IOH = -1.0 mA) 2.4 V VOH2 Output High Voltage ( IOH = -100 µA) V DD-0.2 V VOL1 Output Low Voltage ( IOL = 2.1 mA) 0.4 V VOL2 Output Low Voltage ( IOL = 100 µA) 0.2 V Notes 4. If VDD < VTP, all memory accesses are blocked regardless of input pin conditions.

Rev. 1.0 Sept. 2007 Page 9 of 14 Read Cycle AC Parameters (TA = -40° C to + 85° C, VDD = 2.7V to 3.6V unless otherwise specified) Symbol Parameter Min Max Units Notes tRC Read Cycle Time 110 - ns tCE Chip Enable Access Time - 60 ns tAA Address Access Time - 110 ns tOH Output Hold Time 20 - ns tAAP Page Mode Address Access Time - 25 ns tOHP Page Mode Output Hold Time 5 - ns tCA Chip Enable Active Time 60 - ns tPC Precharge Time 50 - ns tBA /UB, /LB Access Time - 20 ns tAS Address Setup Time (to /CE low) 0 - ns tAH Address Hold Time (/CE-controlled) 60 - ns tOE Output Enable Access Time - 15 ns tHZ Chip Enable to Output High-Z - 10 ns 1 tOHZ Output Enable High to Output High-Z - 10 ns 1 tBHZ /UB, /LB High to Output High-Z - 10 ns 1 Write Cycle AC Parameters (TA = -40° C to + 85° C, VDD = 2.7V to 3.6V unless otherwise specified) Symbol Parameter Min Max Units Notes tWC Write Cycle Time 110 - ns tCA Chip Enable Active Time 60 - ns tCW Chip Enable to Write Enable High 60 - ns tPC Precharge Time 50 - ns tBHZ /UB, /LB High to Output High-Z 5 ns tPWC Page Mode Write Enable Cycle Time 25 - ns tWP Write Enable Pulse Width 16 - ns tAS Address Setup Time (to /CE low) 0 - ns tASP Page Mode Address Setup Time (to /WE low) 8 - ns tAHP Page Mode Address Hold Time (to /WE low) 15 - ns tWLC Write Enable Low to /CE High 25 - ns tWLA Write Enable Low to A(16:2) Change 25 - ns tAWH A(16:2) Change to Write Enable High 110 - ns tDS Data Input Setup Time 14 - ns tDH Data Input Hold Time 0 - ns tWZ Write Enable Low to Output High Z - 10 ns 1 tWX Write Enable High to Output Driven 10 - ns 1 tWS Write Enable to /CE Low Setup Time 0 - ns 2 tWH Write Enable to /CE High Hold Time 0 - ns 2 Notes 1. This parameter is characterized but not 100% tested. 2. The relationship between /CE and /WE determines if a /CE- or /WE-controlled write occurs. The parameters tWS and tWH are not tested. Capacitance (TA = 25° C , f=1 MHz, VDD = 3.3V) Symbol Parameter Min Max Units Notes CI/O Input/Output Capacitance (DQ) - 8 pF CIN Input Capacitance - 6 pF CZZ Input Capacitance of /ZZ pin - 8 pF

Rev. 1.0 Sept. 2007 Page 10 of 14 Power Cycle and Sleep Mode Timing (TA = -40° C to + 85° C, VDD = 2.7V to 3.6V unless otherwise specified) Symbol Parameter Min Max Units Notes tPU Power Up to First Access Time (after V TP is reached) 450 - µs tPD Last Write (/WE high) to Power Down Time (prior to V TP) 0 - µs tVR V DD Rise Time 50 - µs/V 1,2 tVF V DD Fall Time 100 - µs/V 1,2 tZZH /ZZ Active to DQ Hi-Z Time - 20 ns tWEZZ Last Write to Sleep Mode Entry Time 0 - µs tZZL /ZZ Active Low Time 1 - µs tZZEN Sleep Mode Entry Time (/ZZ low to /CE don’t care) - 0 µs tZZEX Sleep Mode Exit Time (/ZZ high to 1 st access after wakeup) - 450 µs Notes 1. Slope measured at any point on VDD waveform. 2. Ramtron cannot test or characterize all V DD power ramp profiles. The behavior of the internal circuits is difficult to predict when VDD is below the level of a transistor threshold voltage. Ramtron strongly recommends that V DD power up faster than 100ms through the range of 0.4V to 1.0V. Data Retention (VDD = 2.7V to 3.6V) Parameter Min Units Notes Data Retention 10 Years AC Test Conditions Input Pulse Levels 0 to 3V Input and Output Timing Levels 1.5V Input Rise and Fall Times 3 ns Output Load Capacitance 30pF Read Cycle Timing 1 (/CE low, /OE low) Read Cycle Timing 2 (/CE-controlled)

Rev. 1.0 Sept. 2007 Page 11 of 14 Page Mode Read Cycle Timing Although sequential column addressing is shown, it is not required. Write Cycle Timing 1 (/WE-Controlled, /OE low) Write Cycle Timing 2 (/CE-Controlled)

Rev. 1.0 Sept. 2007 Page 12 of 14 Write Cycle Timing 3 (/CE low) Page Mode Write Cycle Timing Although sequential column addressing is shown, it is not required. Power Cycle and Sleep Mode Enter/Exit Timing

Rev. 1.0 Sept. 2007 Page 13 of 14 Mechanical Drawing 44-pin TSOP-II (Complies with JEDEC Standard MS-024g Var. AC) Pin 1

10.16 BSC

1.20 max 0.10 mm 0.6 0.4 0.20 0.12 1.50 Recommended PCB Footprint 18.41 BASIC 0.8 0.15 0.05 0°-8° 0.45 0.300.80 BSC 11.96 11.56 0.5 12.6 Note: All dimensions in millimeters . Legend: XXXXXX= part number, S= speed, P=package LLLLLL= lot code, YY=year, WW=work week Examples: FM21L16, 60ns access time, “Green”/RoHS TSOP-II package, Lot 6340282, Year 2007, Work Week 31 RAMTRON FM21L16-60-TG 6340282 0731 RAMTRON XXXXXXX-S-P LLLLLLL YYWW

Rev. 1.0 Sept. 2007 Page 14 of 14

Revision History

1.0 9/24/07 Initial release.