M48Z02 STMICROELECTRONICS | Alldatasheet

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16 Kbit (2Kb x 8) ZEROPOWER® SRAM

INTEGRATED ULTRA LOW POWER SRAM, POWER-FAIL CONTROL CIRCUIT and BATTERY UNLIMITED WRITE CYCLES READ CYCLE TIME EQUALS WRITE CYCLE TIME AUTOMATIC POWER-FAIL CHIP DESELECT and WRITE PROTECTION WRITE PROTECT VOLTAGES PFD = Power-fail Deselect Voltage): – M48Z02: 4.50V ≤ VPFD ≤ 4.75V – M48Z12: 4.20V ≤ VPFD ≤ 4.50V SELF-CONTAINED BATTERY in the CAPHAT DIP PACKAGE PIN and FUNCTION COMPATIBLE with JEDEC STANDARD 2K x 8 SRAMs

DESCRIPTION

® RAM is a 2K x 8 non-volatile static RAM which is pin and functional compatible with the DS1220. A special 24 pin 600mil DIP CAPHAT package houses the M48Z02/12 silicon with a long life lith- ium button cell to form a highly integrated battery backed-up memory solution. The M48Z02/12 button cell has sufficient capacity and storage life to maintain data and clock function- ality for an accumulated time period of at least 10 years in the absence of power over the operating temperature range. AI01186 A0-A10 W DQ0-DQ7 VCC M48Z02 M48Z12 G VSS E Figure 1. Logic Diagram Table 1. Signal Names

  1. Soldering temperature not to exceed 260°C for 10 seconds (total thermal budget not to exceed 150°C for longer than 30 seconds).

CAUTION: Negative undershoots below –0.3 volts are not allowed on any pin while in the Battery Back-up mode. Table 2. Absolute Maximum Ratings (1) Notes: X = VIH or VIL; VSO = Battery Back-up Switchover Voltage. Table 3. Operating Modes Figure 2. DIP Pin Connections equivalent to any JEDEC standard 2K x 8 SRAM. single 5V supply for an out of tolerance condition.

Notes:1. Outputs Deselected.

  1. Negative spikes of –1V allowed for up to 10ns once per cycle.

Table 6. DC Characteristics Notes:1. Effective capacitance measured with power supply at 5V. Table 5. Capacitance (1) Note: 1. All voltages referenced to VSS . Table 7. Power Down/Up Trip Points DC Characteristics (1)

  1. VPFD (min) to VSO fall time of less than tFB may cause corruption of RAM data.

Table 8. Power Down/Up Mode AC Characteristics Figure 5. Power Down/Up Mode AC Waveforms reset is being applied to the processor, a reset condition may not occur until after the system clock is running.

Table 9. Read Mode AC Characteristics Figure 6. Read Mode AC Waveforms Note: Write Enable (W) = High.

Table 10. Write Mode AC Characteristics disable the outputs tWLQZ after W falls.

ORDERING INFORMATION SCHEME Supply Voltage and Write Protect Voltage 02 V CC = 4.75V to 5.5V VPFD = 4.5V to 4.75V 12 V CC = 4.5V to 5.5V VPFD = 4.2V to 4.5V Speed -70 70ns -150 150ns -200 200ns Package PC PCDIP24 Temp. Range 1 0 to 70 °C 6 –40 to 85 °C Example: M48Z02 -70 PC 1 For a list of available options (Speed, Package, etc...) or for further information on any aspect of this device, please contact the STMicroelectronics Sales Office nearest to you. M48Z02, M48Z12

A L B1 B e1 D E N C eA Symb mm inches Typ Min Max Typ Min Max A 8.89 9.65 0.350 0.380 A1 0.38 0.76 0.015 0.030 A2 8.38 8.89 0.330 0.350 B 0.38 0.53 0.015 0.021 B1 1.14 1.78 0.045 0.070 C 0.20 0.31 0.008 0.012 D 34.29 34.80 1.350 1.370 E 17.83 18.34 0.702 0.722 e1 2.29 2.79 0.090 0.110 e3 25.15 30.73 0.990 1.210 eA 15.24 16.00 0.600 0.630 L 3.05 3.81 0.120 0.150 N2 4 2 4 Drawing is not to scale. PCDIP24 - 24 pin Plastic DIP, battery CAPHAT M48Z02, M48Z12

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics © 1999 STMicroelectronics - All Rights Reserved All other names are the property of their respective owners STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. http://www.st.com M48Z02, M48Z12