Datasheet
SCBS123F − AUGUST 1992 − REVISED APRIL 2004
22
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
T
A
= 25°C SN54ABT8646 SN74ABT8646
UNIT
PARAMETER
TEST CONDITIONS
MIN TYP
†
MAX MIN MAX MIN MAX
UNIT
V
IK
V
CC
= 4.5 V, I
I
= −18 mA −1.2 −1.2 −1.2 V
V
CC
= 4.5 V, I
OH
= −3 mA 2.5 2.5 2.5
V
OH
V
CC
= 5 V, I
OH
= −3 mA 3 3 3
V
V
OH
V
CC
= 4.5 V
I
OH
= −24 mA 2 2
V
V
CC
= 4.5 V
I
OH
= −32 mA 2* 2
V
OL
V
CC
= 4.5 V
I
OL
= 48 mA 0.55 0.55
V
V
OL
V
CC
= 4.5 V
I
OL
= 64 mA 0.55* 0.55
V
I
I
CLK, DIR,
OE
, S, TCK
V
CC
= 5.5 V, V
I
= V
CC
or GND
±1 ±1 ±1
µA
I
I
A or B ports
V
CC
= 5.5 V, V
I
= V
CC
or GND
±100 ±100 ±100
µA
I
IH
TDI, TMS V
CC
= 5.5 V, V
I
= V
CC
10 10 10 µA
I
IL
TDI, TMS V
CC
= 5.5 V, V
I
= GND −40 −160 −40 −160 −40 −160 µA
I
OZH
‡
V
CC
= 5.5 V, V
O
= 2.7 V 50 50 50 µA
I
OZL
‡
V
CC
= 5.5 V, V
O
= 0.5 V −50 −50 −50 µA
I
off
V
CC
= 0, V
I
or V
O
≤ 4.5 V ±100 ±100 µA
I
OZPU
V
CC
= 0 to 2 V, V
O
= 0.5 V or 2.7 V ±50 ±50 ±50 µA
I
OZPD
V
CC
= 2 V to 0, V
O
= 0.5 V or 2.7 V ±50 ±50 ±50 µA
I
CEX
Outputs high V
CC
= 5.5 V, V
O
= 5.5 V 50 50 50 µA
I
O
§
V
CC
= 5.5 V, V
O
= 2.5 V −50 −100 −180 −50 −180 −50 −180 mA
V
CC
= 5.5 V,
Outputs high 0.9 2 2 2
I
CC
A or B ports
V
CC
= 5.5 V,
I
O
= 0,
V = V or GND
Outputs low 30 38 38 38
mA
I
CC
A or B ports
I
O
= 0,
V
I
= V
CC
or GND
Outputs disabled 0.9 2 2 2
mA
∆I
CC
¶
V
CC
= 5.5 V, One input at 3.4 V,
1.5
1.5
1.5
mA
∆I
CC
¶
V
CC
= 5.5 V, One input at 3.4 V,
Other inputs at V
CC
or GND
1.5 1.5 1.5 mA
C
i
Control inputs V
I
= 2.5 V or 0.5 V 3 pF
C
io
A or B ports V
O
= 2.5 V or 0.5 V 10 pF
C
o
TDO V
O
= 2.5 V or 0.5 V 8 pF
* On products compliant to MIL-PRF-38535, this parameter does not apply.
†
All typical values are at V
CC
= 5 V.
‡
The parameters I
OZH
and I
OZL
include the input leakage current.
§
Not more than one output should be tested at a time, and the duration of the test should not exceed one second.
¶
This is the increase in supply current for each input that is at the specified TTL voltage level, rather than V
CC
or GND.