SN54ABT16501, SN74ABT16501
18-BIT UNIVERSAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SCBS086C – FEBRUARY 1991 – REVISED JANUARY 1997
SN54ABT16501 . . . WD PACKAGE
SN74ABT16501 . . . DGG OR DL PACKAGE
(TOP VIEW)
Members of the Texas Instruments
Widebus Family
State-of-the-Art EPIC-ΙΙB BiCMOS Design
Significantly Reduces Power Dissipation
OEAB
LEAB
A1
GND
A2
GND
CLKAB
B1
GND
B2
1
2
3
4
5
6
7
8
9
56
55
54
53
52
51
50
49
48
UBT (Universal Bus Transceiver)
Combines D-Type Latches and D-Type
Flip-Flops for Operation in Transparent,
Latched, or Clocked Mode
A3
B3
ESD Protection Exceeds 2000 V Per
MIL-STD-883, Method 3015; Exceeds 200 V
Using Machine Model (C = 200 pF, R = 0)
V
V
CC
CC
A4
A5
B4
B5
Latch-Up Performance Exceeds 500 mA Per
JEDEC Standard JESD-17
A6 10
47 B6
GND
A7
GND
B7
11
12
46
45
Typical V
< 0.8 V at V
(Output Ground Bounce)
OLP
= 5 V, T = 25°C
CC
A
A8 13
A9 14
44 B8
Flow-Through Architecture Optimizes PCB
Layout
43 B9
A10 15
A11 16
A12 17
GND 18
A13 19
A14 20
A15 21
42 B10
41 B11
40 B12
39 GND
38 B13
37 B14
36 B15
Package Options Include Plastic 300-mil
Shrink Small-Outline (DL) and Thin Shrink
Small-Outline (DGG) Packages and 380-mil
Fine-Pitch Ceramic Flat (WD) Package
Using 25-mil Center-to-Center Spacings
description
V
22
35
V
CC
CC
A16 23
34 B16
These 18-bit universal bus transceivers consist of
storage elements that can operate either as
D-type latches or D-type flip-flops to allow data
flow in transparent or clocked modes.
A17 24
33 B17
GND 25
A18 26
32 GND
31 B18
OEBA 27
LEBA 28
30 CLKBA
29 GND
Data flow in each direction is controlled by
output-enable (OEAB and OEBA), latch-enable
(LEAB and LEBA), and clock (CLKAB and
CLKBA) inputs. For A-to-B data flow, the device
operates in the transparent mode when LEAB is
high. When LEAB is low, the A data is latched if
CLKAB is held at a high or low logic level. If LEAB
is low, the A data is stored in the latch/flip-flop on
the low-to-high transition of CLKAB. When OEAB
is high, the outputs are active. When OEAB is low,
the outputs are in the high-impedance state.
Data flow for B to A is similar to that of A to B but uses OEBA, LEBA, and CLKBA. The output enables are
complementary (OEAB is active high and OEBA is active low).
To ensure the high-impedance state during power up or power down, OE should be tied to GND through a
pulldown resistor and OE should be tied to V
determined by the current-sourcing/current-sinking capability of the driver.
through a pullup resistor; the minimum value of the resistor is
CC
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Widebus, EPIC-ΙΙB, and UBT are trademarks of Texas Instruments Incorporated.
Copyright 1997, Texas Instruments Incorporated
UNLESS OTHERWISE NOTED this document contains PRODUCTION
DATA information current as of publication date. Products conform to
specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all
parameters.
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265