SN54ABT652A

` State-of-the-Art EPIC-IIBE BiCMOS Design Significantly Reduces Power Dissipation
` ESD Protection Exceeds 2000 V Per MIL-STD-883, Method 3015; Exceeds 200 V Using Machine Model (C = 200 pF, R = 0)
` Latch-Up Performance Exceeds 500 mA Per JEDEC Standard JESD-17
` Typical V_OLP (Output Ground Bounce) < 1 V at V_CC = 5 V, T_A = 25
` High-Drive Outputs (32-mA IOH, 64-mA I<sub>OL</sub>)
` Package Options Include Plastic Small-Outline (DW), Shrink Small-Outline (DB), and Thin Shrink Small-Outline (PW) Packages, Ceramic Chip Carriers (FK),Ceramic Flat (W) Package, and Plastic (NT) and Ceramic (JT) DIPs

Supply voltage range, V_CC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.5 V to 7 V
Input voltage range, V_I (except I/O ports) (see Note 1) . . . . . . . . . . . . . . 0.5 V to 7 V
Voltage range applied to any output in the high or power-off state, V_O . 0.5 V to 5.5 V
Current into any output in the low state, I_O: SN54ABT652A . . . . . . . . . . . . . . . . . 96 mA
SN74ABT652A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128 mA
Input clamp current, I_IK (V_I < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 mA
Output clamp current, I_OK (V_O < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50 mA
Package thermal impedance, _JA (see Note 2): DB package . . . . . . . . . . . . . . . .104/W
DW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81/W
NT package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  67/W
PW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120/W
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 to 150

† Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed.
2. The package thermal impedance is calculated in accordance with EIA/JEDEC Std JESD51, except for through-hole packages, which use a trace length of zero.

SN54ABT652A consist of bus-transceiver circuits,D-type flip-flops, and control circuitry arranged for multiplexed transmission of data directly from the data bus or from the internal storage registers.Output-enable (OEAB and OEBA) inputs of SN54ABT652A are provided to control the transceiver functions.Select-control (SAB and SBA) inputs are provided to select either real-time or stored data for transfer. The circuitry used for select control eliminates the typical decoding glitch that occurs in a multiplexer during the transition between stored and real-time data. A low input selects real-time data, and a high input of SN54ABT652A selects stored data. Figure 1 illustrates the four fundamental bus-management functions that can be performed with the 'ABT652A.

Data on the A- or B-data bus, or both, SN54ABT652A can be stored in the internal D-type flip-flops by low-to-high transitions at the appropriate clock (CLKAB or CLKBA) inputs, regardless of the select- or enable-control inputs. When SAB and SBA of SN54ABT652A are in the real-time transfer mode, it is possible to store data without using the internal D-type flip-flops by simultaneously enabling OEAB and OEBA. In this configuration, each output reinforces its input. When all other data sources to the two sets of bus lines are at high impedance, each set of bus lines remains at its last state.

To ensure the high-impedance state of SN54ABT652A during power up or power down, OEBA should be tied to V_CC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver (B to A). OEAB should be tied to GND through a pulldown resistor; the minimum value of the resistor is determined by the current-sourcing capability of the driver (A to B).

The SN54ABT652A is characterized for operation over the full military temperature range of 55 to 125.The SN74ABT652A is characterized for operation from 40 to 85.