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
JESD 17
Typical VOLP (Output Ground Bounce) < 1 V
at VCC = 5 V, TA = 25°C
High-Drive Outputs (–32-mA IOH,
64-mA IOL)
Multiplexed Real-Time and Stored Data
Inverting Data Paths
Package Options Include Plastic
Small-Outline (DW), Shrink Small-Outline
DB), and Thin Shrink Small-Outline (PW)
Packages, Ceramic Chip Carriers (FK), and
Plastic (NT) and Ceramic (JT) DIPs

description
These devices 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 are
provided to control the transceiver functions. The
select-control (SAB and SBA) inputs are provided
to select whether real-time or stored data is
transferred. A low input level selects real-time
data, and a high input level selects stored data.
Figure 1 illustrates the four fundamental
bus-management functions that can be
performed with the ’ABT651 devices.
Data on the A or B bus, or both, can be stored in the internal D flip-flops by low-to-high transitions at the
appropriate clock (CLKAB or CLKBA) inputs, regardless of the select- or enable-control pins. When SAB and
SBA are in the real-time transfer mode, it also 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
the other data sources to the two sets of bus lines are at high impedance, each set remains at its last state.
To ensure the high-impedance state during power up or power down, OEBA should be tied to VCC 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).