SN54ALS640B Datasheet, PDF (3/7 Pages) Texas Instruments – OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS

SN54ALS640B, SN54AS640, SN74ALS640B, SN74AS640
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS122A – DECEMBER 1983 – REVISED JANUARY 1995
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54ALS640B
MIN TYP† MAX
SN74ALS640B
MIN TYP† MAX ^UNIT
VIK
VOH
VOL
Control inputs
II
A or B ports
Control inputs
IIH
A or B ports§
VCC = 4.5 V,
VCC = 4.5 V to 5.5 V,
VCC = 4.5 V
VCC = 4.5 V
VCC = 5.5 V
VCC = 5.5 V,
II = – 18 mA
IOH = – 0.4 mA
IOH = – 3 mA
IOH = – 12 mA
IOH = – 15 mA
IOL = 12 mA
IOL = 24 mA
IOL = 48 mA‡
VI = 7 V
VI = 5.5 V
VI = 2.7 V
– 1.5
– 1.5 V
VCC – 2
VCC – 2
2.4 3.2
2.4 3.2
V
2
2
0.25 0.4
0.25 0.4
0.35 0.5 V
0.35 0.5
0.1
0.1
mA
0.1
0.1
20
20
µA
20
20
Control inputs
IIL
A or B ports§
VCC = 5.5 V,
IO¶
VCC = 5.5 V,
VI = 0.4 V
VO = 2.25 V
Outputs high
– 0.1
– 0.1
– 0.1
mA
– 0.1
– 20
– 112 – 30
– 112 mA
19
50
19
45
ICC
VCC = 5.5 V
Outputs low
27
60
27
55 mA
Outputs disabled
28
55
28
50
† _{All typical values are at VCC = 5 V, TA = 25°C.}
‡ _{Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V}
§ _{For I/O ports, the parameters IIH and IIL include the off-state output current.}
¶ _{The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.}
switching characteristics (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500 Ω,
R2 = 500 Ω,
TA = MIN to MAX#
SN54ALS640B SN74ALS640B
MIN MAX MIN MAX
tPLH
tPHL
A or B
B or A
2
14
2
13
2
11
2
10
tPZH
OE
tPZL
A or B
4
25
5
27
4
21
5
24
tPHZ
OE
tPLZ
A or B
2
12
3
20
2
10
3
15
# _{For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.}
UNIT
ns
ns
ns
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
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