SN74AS1805
HEX 2-INPUT NOR DRIVER
SDAS043C – AUGUST 1984 – REVISED JANUARY 1995
DW OR N PACKAGE
(TOP VIEW)
• High Capacitive-Drive Capability
• Typical Delay Time of 2.6 ns (C = 50 pF)
L
and Typical Power Dissipation of Less
Than 12 mW Per Gate
5B
6Y
6A
6B
5A
5Y
4B
4A
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
• Center V
and GND Configuration
Provides Minimum Lead Inductance in
High-Current Switching Applications
CC
V
4Y
GND
3Y
CC
1A
• Package Options Include Plastic
Small-Outline (DW) Packages and Standard
Plastic (N) 300-mil DIPs
1B
1Y
2A
2B
13 3B
12 3A
description
11
2Y
This device contains six independent 2-input NOR
drivers. It performs the Boolean functions
Y = A + B or Y = A • B in positive logic.
The center-pin configuration reduces lead inductance when compared to the ′AS805B. This reduced lead
inductance minimizes noise generated onto either the V
high-current switching applications.
or GND bus. This reduction is significant in
CC
The SN74AS1805 is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
(each driver)
INPUTS
OUTPUT
Y
A
B
X
H
L
H
X
L
L
L
H
†
logic symbol
logic diagram (positive logic)
6
1A
7
6
≥1
8
1A
7
8
11
14
16
19
2
1Y
2Y
3Y
4Y
5Y
6Y
1Y
2Y
3Y
4Y
5Y
6Y
1B
9
1B
9
2A
2A
10
2B
12
3A
13
3B
17
4A
18
4B
20
5A
1
11
14
16
19
2
10
2B
12
3A
13
3B
17
4A
18
4B
20
5A
1
5B
3
5B
6A
4
3
6A
4
6B
6B
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.
Copyright 1995, 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.
1
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