74ACT16254_09 Datasheet, PDF (1/6 Pages) Texas Instruments – 16-BIT ADDRESS/DATA MULTIPLEXER

74ACT16254
16ĆBIT ADDRESS/DATA MULTIPLEXER
WITH 3ĆSTATE OUTPUTS
SCAS527A − AUGUST 1995 − NOVEMBER 1995
D Member of the Texas Instruments
Widebus  Family
D Latch-Up Performance Exceeds 500 mA
Per JEDEC Standard JESD-17
D Bus-Hold Inputs Eliminate the Need for
External Pullup Resistors
D Typical V_OLP (Output Ground Bounce)
< 0.8 V at V_CC = 5 V, T_A = 25°C
D Distributed V_CC and GND Pin Configuration
Minimizes High-Speed Switching Noise
D Packaged in Plastic Thin Shrink
Small-Outline (DGG) Package
description
The 74ACT16254 is a dual 16-bit, noninverting
bus-interface device. The A and C ports perform
a transceiver function, like that of the 74ACT245.
The B and C ports perform the buffer/driver
function of the 74ACT244. The A and C port
outputs are designed to sink up to 12 mA.
The 74ACT16254 is designed for asynchronous
communication between data buses. The control
function implementation minimizes external
timing requirements.
Data transmission from the A port to the C port,
C port to A port, or B port to C port is accomplished
by setting the appropriate logic levels on the bus
enable (EN1 and EN2) inputs.
All outputs are disabled when logic highs are
placed on both EN1 and EN2; the buses are
effectively isolated.
The 74ACT16254 is packaged in TI’s thin shrink
small-outline package (DGG), which provides
twice the I/O pin count and functionality of
standard small-outline packages in the same
printed-circuit-board area.
DGG PACKAGE
(TOP VIEW)
B1 ₁
B3 ₂
B6 ₃
B7 ₄
B9 ₅
GND ₆
B11 ₇
B13 ₈
B15 ₉
V_{CC 10}
A16 ₁₁
A15 ₁₂
A14 ₁₃
GND ₁₄
A13 ₁₅
A12 ₁₆
A11 ₁₇
A10 ₁₈
GND ₁₉
A9 ₂₀
A8 ₂₁
A7 ₂₂
V_CC 23
A6 24
A5 25
A4 26
GND 27
A3 28
A2 29
A1 30
EN2 31
EN1 32
64 ^B2
63 ^B4
62 ^B6
61 ^B8
60 ^B10
59 ^GND
58 ^B12
57 ^B14
56 ^B16
55 ^V_CC
54 ^C16
53 ^C15
52 ^C14
51 ^GND
50 ^C13
49 ^C12
48 ^C11
47 ^C10
46 ^GND
45 ^C9
44 ^C8
43 ^C7
42 V_CC
41 C6
40 C5
39 C4
38 GND
37 C3
36 C2
35 C1
34 NC
33 NC
NC − No internal connection
Active bus-hold circuitry is provided to hold unused or floating data and I/O pins at a valid logic level.
The 74ACT16254 is characterized for operation from − 40°C to 85°C.
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 is a trademark of Texas Instruments Incorporated.
PRODUCTION DATA information is 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.
Copyright  1995, Texas Instruments Incorporated
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
• POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
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