SN74ABTE16245

Features:

􀀀 Members of the Texas Instruments Widebus^TM Family
􀀀 Support the VME64 ETL Specification
􀀀 Reduced, TTL-Compatible, Input Threshold Range
􀀀 High-Drive Outputs (I_OH = 60 mA, I_OL = 90 mA) Support 25- Incident-Wave Switching
􀀀 V_CCBIAS Pin Minimizes Signal Distortion During Live Insertion
􀀀 Internal Pullup Resistor on OE Keeps Outputs in High-Impedance State During Power Up or Power Down
􀀀 Distributed V_CC and GND Pins Minimize High-Speed Switching Noise
􀀀 Equivalent 25- Series Damping Resistor on B Port
􀀀 Bus Hold on Data Inputs Eliminates the Need for External Pullup/Pulldown Resistors


Pinout




Specifications

Supply voltage range, V_CC and V_CCBIAS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 state or power-off state, V_O . . . . . . . . . . . . 0.5 V to 5.5 V
Current into any output in the low state, I_O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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): DGG package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70°C/W
                                                                          DL package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63°C/W
Storage temperature range, T_stg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to 150°C
‡ 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 JESD 51-7.


Description

The 'ABTE16245 devices are 16-bit (dual-octal) noninverting 3-state transceivers designed for synchronous two-way communication between data buses. The 'ABTE16245 control-function implementation minimizes external timing requirements. These devices can be used as two 8-bit transceivers or one 16-bit transceiver. They allow data transmission from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE ) input can be used to disable the device so that the buses are effectively isolated. When OE is low, the device is active.

The B port of 'ABTE16245  has an equivalent 25- series output resistor to reduce ringing. Active bus-hold inputs also are on the B port to hold unused or floating inputs at a valid logic level.The A port provides for the precharging of the outputs via V_CCBIAS, which establishes a voltage between 1.3 V and 1.7 V when V_CC is not connected.

Active bus-hold circuitry of 'ABTE16245 holds unused or undriven inputs at a valid logic state. Use of pullup or pulldown resistors with the bus-hold circuitry is not recommended.