Datasheet

SN54BCT8240A, SN74BCT8240A
SCAN TEST DEVICES
WITH OCTAL INVERTING BUFFERS
SCBS067E – FEBRUARY 1990 – REVISED DECEMBER 1996
19
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (normal mode) (see Figure 9)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
= 5 V,
T
A
= 25°C
SN54BCT8240A SN74BCT8240A
UNIT
(INPUT)
(OUTPUT)
MIN TYP MAX MIN MAX MIN MAX
t
PLH
A
Y
2.5 5.7 7.5 2.5 10 2.5 9
ns
t
PHL
A
Y
2.5 5.2 7 2.5 9 2.5 8
ns
t
PZH
OE
Y
3 6 8 3 10 3 9.5
ns
t
PZL
OE
Y
3.5 7 9 3.5 12 3.5 11
ns
t
PHZ
OE
Y
2.5 6 8 2.5 10 2.5 9
ns
t
PLZ
OE
Y
2.5 5.5 8 2.5 10 2.5 9
ns
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (test mode) (see Figure 9)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
= 5 V,
T
A
= 25°C
SN54BCT8240A SN74BCT8240A
UNIT
(INPUT)
(OUTPUT)
MIN TYP MAX MIN MAX MIN MAX
f
max
TCK 20 20 20 MHz
t
PLH
TCK↓
Y
6 13 15.5 6 21.5 6 20
ns
t
PHL
TCK↓
Y
6 12.5 15.5 6 21.5 6 20
ns
t
PLH
TCK↓
TDO
3.5 7.6 10.5 3.5 14 3.5 13
ns
t
PHL
TCK↓
TDO
3.5 8 10.5 3.5 13 3.5 12
ns
t
PLH
TCK↑
Y
7.5 16.5 20 7.5 28 7.5 24
ns
t
PHL
TCK↑
Y
7.5 17 21 7.5 29 7.5 25
ns
t
PZH
TCK↓
Y
6.5 14 17 6.5 24 6.5 21
ns
t
PZL
TCK↓
Y
7 15 20 7 26 7 23
ns
t
PZH
TCK↓
TDO
3.5 7.6 10.5 3.5 11.5 3.5 11
ns
t
PZL
TCK↓
TDO
4 8.5 11 4 13.5 4 12.5
ns
t
PZH
TCK↑
Y
8 18 22 8 30 8 27
ns
t
PZL
TCK↑
Y
8 19 25 8 32 8 29
ns
t
PHZ
TCK↓
Y
6 14 18 6 24 6 22
ns
t
PLZ
TCK↓
Y
6 14 17 6 23 6 21
ns
t
PHZ
TCK↓
TDO
3 8 11.5 3 13 3 12.5
ns
t
PLZ
TCK↓
TDO
3 7.5 10 3 13 3 12
ns
t
PHZ
TCK↑
Y
8 18.5 22 8 31 8 27
ns
t
PLZ
TCK↑
Y
8 18.5 22 8 31 8 27
ns