16-BIT BUFFERS/DRIVERS - Texas Instruments
Description
SN54AHCT16540, SN74AHCT16540
16-BIT BUFFERS/DRIVERS WITH 3-STATE OUTPUTS
SCLS338H – MARCH 1996 – REVISED JANUARY 2000
D Members of the Texas Instruments
Widebus ™ Family
D EPIC ™ (Enhanced-Performance Implanted
CMOS) Process
D Inputs Are TTL-Voltage Compatible D Distributed VCC and GND Pins Minimize
High-Speed Switching Noise
D Flow-Through Architecture Optimizes PCB
Layout
D Latch-Up Performance Exceeds 250 mA Per
JESD 17
D ESD Protection Exceeds 2000 V Per
MIL-STD-883, Method 3015; Exceeds 200 V Using Machine Model (C = 200 pF, R = 0)
D Package Options Include Plastic Shrink
Small-Outline (DL), Thin Shrink Small-Outline (DGG), and Thin Very Small-Outline (DGV) Packages and 380-mil Fine-Pitch Ceramic Flat (WD) Package Using 25-mil Center-to-Center Spacings
description
These 16-bit buffers and bus drivers provide a high-performance bus interface for wide data paths.
The 3-state control gate is a 2-input AND gate with active-low inputs so that if either output-enable (OE1 or OE2) input is high, all corresponding outputs are in the high-impedance state.
SN54AHCT16540 .
.
.
WD PACKAGE SN74AHCT16540 .
.
.
DGG, DGV, OR DL PACKAGE
(TOP VIEW)
1OE1 1 1Y1 2 1Y2 3 GND 4 1Y3 5 1Y4 6 VCC 7 1Y5 8 1Y6 9 GND 10 1Y7 11 1Y8 12 2Y1 13 2Y2 14 GND 15 2Y3 16 2Y4 17 VCC 18 2Y5 19 2Y6 20 GND 21 2Y7 22 2Y8 23
2OE1 24
48 1OE2 47 1A1 46 1A2 45 GND 44 1A3 43 1A4 42 VCC 41 1A5 40 1A6 39 GND 38 1A7 37 1A8 36 2A1 35 2A2 34 GND 33 2A3 32 2A4 31 VCC 30 2A5 29 2A6 28 GND 27 2A7 26 2A8 25 2OE2
To ensure the high-impedance state during power up or power down, OE 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.
The SN54AHCT16540 is characterized for operation over the full military temperature range of –55°C to 125°C.
The SN74AHCT16540 is characterized for operation from –40°C to 85°C.
FUNCTION TABLE (each 8-bit buffer/driver)
INPUTS OE1 OE2 A
OUTPUT Y
L
L
L
H
L
L
H
L
H
X
X
Z
X
H
X
...
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