Document
SN54ALS27A, SN54AS27, SN74ALS27A, SN74AS27 TRIPLE 3ĆINPUT POSITIVEĆNOR GATES
• Package Options Include Plastic
Small-Outline (D) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs
description
These devices contain three independent 3-input positive-NOR gates. They perform the Boolean functions Y = A • B • C or Y = A + B + C in positive logic.
The SN54ALS27A and SN54AS27 are characterized for operation over the full military temperature range of − 55°C to 125°C. The SN74ALS27A and SN74AS27 are characterized for operation from 0°C to 70°C.
FUNCTION TABLE (each gate)
INPUTS
A
B
C
OUTPUT Y
H
X
X
L
X
H
X
L
X
X
H
L
L
L
L
H
logic symbol†
1
1A
≥1
2 1B
13 1C
3 2A
4 2B
5 2C
9 3A
10 3B
11 3C
12 1Y
6 2Y
8 3Y
† This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
Pin numbers shown are for the D, J, and N packages.
SDAS112B − APRIL 1982 − REVISED DECEMBER 1994
SN54ALS27A, SN54AS27 . . . J PACKAGE SN74ALS27A, SN74AS27 . . . D OR N PACKAGE
(TOP VIEW)
1A 1 1B 2 2A 3 2B 4 2C 5 2Y 6 GND 7
14 VCC 13 1C 12 1Y 11 3C 10 3B 9 3A 8 3Y
SN54ALS27A, SN54AS27 . . . FK PACKAGE (TOP VIEW)
1C
VCC
NC
1A
1B
3 2 1 20 19
2A 4
18 1Y
NC 5
17 NC
2B 6
16 3C
NC 7
15 NC
2C 8
14 3B
9 10 11 12 13
3A
3Y
NC
GND
2Y
NC − No internal connection
logic diagram (positive logic)
1 1A
2 1B
13 1C
3 2A
4 2B
5 2C
9 3A
10 3B
11 3C
12 1Y
6 2Y
8 3Y
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 1994, Texas Instruments Incorporated
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
1
• POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
SN54ALS27A, SN54AS27, SN74ALS27A, SN74AS27 TRIPLE 3ĆINPUT POSITIVEĆNOR GATES
SDAS112B − APRIL 1982 − REVISED DECEMBER 1994
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Operating free-air temperature range, TA: SN54ALS27A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −55°C to 125°C
SN74ALS27A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65°C to 150°C
† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
recommended operating conditions
VCC VIH
Supply voltage High-level input voltage
VIL
Low-level input voltage
IOH
High-level output current
IOL
Low-level output current
TA
Operating free-air temperature
‡ Applies over temperature range − 55°C to 70°C § Applies over temperature range 70°C to 125°C
SN54ALS27A
MIN NOM MAX
4.5
5 5.5
2 0.8‡ 0.7§
− 0.4
4
− 55
125
SN74ALS27A
MIN NOM MAX
4.5
5 5.5
2
0.8
UNIT V V
V
−0.4 mA
8 mA
0
70 °C
electrical characteristics over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
SN54ALS27A MIN TYP¶ MAX
SN74ALS27A MIN TYP¶ MAX UNIT
VIK
VCC = 4.5 V,
II = −18 mA
−1.5
−1.5 V
VOH
VCC = 4.5 V to 5.5 V,
IOH = − 0.4 mA
VCC − 2
VCC − 2
V
VOL
VCC = 4.5 V
IOL = 4 mA IOL = 8 mA
0.25 0.4
0.25 0.4 V
0.35 0.5
II
VCC = 5.5 V,
VI = 7 V
0.1
0.1 mA
IIH
VCC = 5.5 V,
VI = 2.7 V
20
20 µA
IIL
VCC = 5.5 V,
IO#
VCC = 5.5 V,
VI = 0.4 V VO = 2.25 V
− 0.1
−0.1 mA
− 20
−112 −30
−112 mA
ICCH
VCC = 5.5 V,
VI = 0
0.97 1.8
0.97 1.8 mA
ICCL
VCC = 5.5 V,
VI = 4.5 V
2
4
2
4 mA
¶ All typical values are at VCC = 5 V, TA = 25°C. # The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.
2
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265 • POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
SN54ALS27A, SN54AS27, SN74ALS27A, SN74AS27 TRIPLE 3ĆINPUT POSITIVEĆNOR GATES
SDAS112B − APRIL 1982 − REVISED DECEMBER 1994
switching characteristics (see Figure 1)
PARAMETER
FROM (INPUT)
TO (OUTPUT)
VCC = 4.5 V to 5.5 V, CL = 50 pF, RL = 500 Ω, TA = MIN to MAX†
SN54ALS27A SN74ALS27A
MIN MAX MIN MAX
tPLH .