54LVTH245A MAXWELL | Alldatasheet

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All data sheets are subject to change without notice (858) 503-3300 - Fax: (858) 503-3301 - www.maxwell.com PRELIMINARY 3.3V ABT Octal Bus Transceiver 54LVTH245A ©2001 Maxwell Technologies All rights reserved. with 3-State Output

12.19.01 Rev 11000597

FEATURES:

  • 3.3V ABT octal bus transceiver with 3-state outputs
  • R AD-PAK® radiation hardened against natural space radia- tion
  • Total dose hardness: - >100 krad (Si), depending upon space misssion
  • Package: - 20 pin RAD-PAK® flat package - 20 pin RAD-PAK® DIP
  • Operating temperature range: -55 to 125°C
  • Supports mixed-mode signal operation - 5V input and output voltages with 3.3V VCC
  • Supports unregulated battery operation down to 2.7V.
  • Typical VOLP (output ground bounce) < 0.8V at V CC=3.3V, TA= 25°C
  • Latch-up performance exceeds 500mA per JEDEC stan- dard
  • Supports live insertion
  • Bus-hold data inputs eliminate the need for external pullup resistors DESCRIPTION: Maxwell Technologies’ 54LVTH245A 8-bit octal transceiver micro-circuit features a grea ter than 100 krad (Si) total dose tolerance, depending upon space mission. The 54LVTH245A is designed specifically for low voltage (3.3V) V CC operation, but with the capability to provide a TTL interface to a 5V sys- tem environment. It is designed for asynchronous communica- tion between data buses. The devic e transmits data from the A bus to the B bus or from the B bus to the A bus depending upon the logic level at the direction control (DIR) input. The output enable (OE ) input can be used to disable the device so the buses are effectively isolated. The 54LVTH245A active bus-hold circuitry is provided to prevent floating data inputs at a valid logic level and to eliminate the need for external pullup resistors. Maxwell Technologies' patented R AD-PAK® packaging technol- ogy incorporates radiation shie lding in the microcircuit pack- age. It eliminates the need for box shielding while providing the required radiation shielding fo r a lifetime in orbit or space mission. In a GEO orbit, R AD-PAK provides greater than 100 krad (Si) radiation dose toleranc e. This product is available with screening up to Class S. Logic Diagram (Positive Logic)

TABLE 1. PINOUT DESCRIPTION

1 DIR DirectionControl

10 GND Ground

19 OE Output Enable

20 V CC Supply Voltage

TABLE 2. 54LVT245 ABSOLUTE MAXIMUM RATINGS 1

  1. Stresses beyond those listed under “absolute maximum ratings ” may cause permanent damage to the device. These are
  2. The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed.
  3. This current flows only when the output is in the high state and V O > VCC.

TABLE 3. DELTA LIMITS

TABLE 4. 54LVTH245A RECOMMENDED OPERATING CONDITIONS 1

  1. Unused control inputs must be held high or low to prevent them from floating.

TABLE 5. 54LVTH245A ELECTRICAL CHARACTERISTICS

  1. This is the increase in supply current for each input t hat is at the specified TTL voltage level rather than VCC or GND.

TABLE 6. 54LVTH245A AC ELECTRICAL CHARACTERISTICS TABLE 7. FUNCTION TABLE TABLE 5. 54LVTH245A ELECTRICAL CHARACTERISTICS

FIGURE 1. LOAD CIRCUIT

  1. CL includes probe and jig capacitance.

FIGURE 2. PULSE DURATION FIGURE 3. SETUP AND HOLD TIMES

FIGURE 4. PROPAGATION DELAY TIMES INVERTING AND NONINVERTING OUTPUTS FIGURE 5. ENABLE AND DISABLE TIMES LOW- AND HIGH-LEVEL ENABLING

  1. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by

7All data sheets are subject to change without notice ©2001 Maxwell Technologies All rights reserved. 3.3V ABT Octal Bus Transceiver with 3-State Output 54LVTH245A Note: All dimensions in inches

20 PIN RAD-PAK® FLAT PACKAGE

A 0.128 0.141 0.154 b 0.015 0.017 0.022 c 0.003 0.005 0.009 D 0.470 0.480 0.490 E 0.287 0.295 0.303 E1 -- -- 0.333 E2 0.155 0.160 -- E3 0.030 0.068 -- e 0.050 BSC L 0.370 0.380 0.390 Q 0.035 0.039 0.042 S1 0.005 0.007 -- N2 0

8All data sheets are subject to change without notice ©2001 Maxwell Technologies All rights reserved. 3.3V ABT Octal Bus Transceiver with 3-State Output 54LVTH245A Important Notice: These data sheets are created using the chip manufacturer’s published specifications. Maxwell Technologies verifies functionality by testing key parameters either by 100% testing, sample testing or characterization. The specifications presented within these data sheets represent the latest and most accurate information available to date. However, these specifications are subject to change without notice and Maxwell Technologies assumes no responsibility for the use of this information. Maxwell Technologies’ products are not authorized for use as critical components in li fe support devices or systems without express written approval from Maxwell Technologies. Any claim against Maxwell Technologies must be made within 90 days from the date of shipment from Maxwell Tech- nologies. Maxwell Technologies’ liability shall be limited to replacement of defective parts.

9All data sheets are subject to change without notice ©2001 Maxwell Technologies All rights reserved. 3.3V ABT Octal Bus Transceiver with 3-State Output 54LVTH245A Feature Option Details54LVTH245A RP F X Screening Flow Package Radiation Feature Base Product Nomenclature Monolithic S = Maxwell Class S B = Maxwell Class B E = Engineering (testing @ +25°C I = Industrial (testing @ -55°C, +25°C, +125°C) F = Flat Pack RP = R AD-PAK® package Octal Bus Transceiver with 3- State Output