HD74CBT1G125
Single FET Bus Switch
ADE-205-645 (Z)
Rev. 0
Jan. 2002
Description
The HD74CBT1G125 features a single high-speed line switch. The switch is disabled when the output
enable (
OE) input is high.
Features
Minimal propagation delay through the switch.
5 switch connection between two ports.
TTL-compatible input levels.
Ultra low quiescent power.
-Ideally suited for notebook applications.
Package type
Package type
Package code
Package suffix
Taping code
CMPAK5pin
CMPAK5
CM
E (3000pcs / Reel)
HD74CBT1G125
Rev.0, Jan. 2002, page 2 of 9
Outline and Article Indication
HD74CBT1G125
Marking
= Control code
( or blank)
B B
Index band
CMPAK5
Function Table
Input
OE
OE
OE
OE Function
L
A port = B port
H Disconnect
H: High
level
L: Low
level
Pin Arrangement
(Top view)
5
4
V
CC
1
2
3
OE
A
GND
B
HD74CBT1G125
Rev.0, Jan. 2002, page 3 of 9
Absolute Maximum Ratings
Item Symbol
Ratings
Unit
Conditions
Supply voltage range
V
CC
-0.5 to 7.0
V
Input voltage range
*1
V
I
-0.5 to 7.0
V
Input clamp current
I
IK
-50 mA
V
I
< 0
Continuous output current
I
O
128
mA
V
O
= 0 to V
CC
Continuous current through
V
CC
or GND
I
CC
or I
GND
100 mA
Maximum power dissipation
at Ta = 25C (in still air)
*2
P
T
200
mW
Storage temperature
Tstg
-65 to 150
C
Notes:
The absolute maximum ratings are values which must not individually be exceeded, and
furthermore, no two of which may be realized at the same time.
1. The input and output voltage ratings may be exceeded even if the input and output clamp-current
ratings are observed.
2. The maximum package power dissipation was calculated using a junction temperature of 150C.
Recommended Operating Conditions
Item
Symbol Min Max Unit Conditions
Supply voltage range
V
CC
4.0 5.5 V
Input voltage range
V
I
0
5.5
V
Output voltage range
V
I/O
0
5.5
V
Input transition rise or fall rate
t / v 0 5 ns
/
V
V
CC
= 4.5 to 5.5 V
Operating free-air temperature
Ta
-40 85 C
Note: Unused or floating inputs must be held high or low.
HD74CBT1G125
Rev.0, Jan. 2002, page 4 of 9
DC Electrical Characteristics
(Ta =
-40 to 85C)
Item Symbol
V
CC
(V)
Min
Typ
*1
Max Unit Test
conditions
Clamp diode voltage
V
IK
4.5
-1.2 V I
IN
=
-18 mA
Input voltage
V
IH
4.0
to
5.5
2.0
V
V
IL
4.0
to
5.5
0.8
On-state switch
resistance
*2
R
ON
4.0
14 20
V
IN
= 2.4 V,
I
IN
= 15 mA
Typ at V
CC
= 4.0 V
4.5
5 7 V
IN
= 0 V,
I
IN
= 64 mA
4.5
5 7 V
IN
= 0 V,
I
IN
= 30 mA
4.5
10 15 V
IN
= 2.4 V,
I
IN
= 15 mA
Input current
I
IN
0 to 5.5
1.0
A V
IN
= 5.5 V or GND
Off-state leakage
current
I
OZ
5.5
1.0
A 0
A, B V
CC
Quiescent supply
current
I
CC
5.5
1.0 A V
IN
= V
CC
or GND,
I
O
= 0 mA
Increase in I
CC
per input
*3
I
CC
5.5
2.5
mA
One input at 3.4 V,
other inputs at V
CC
or
GND
Notes:
For condition shown as Min or Max use the appropriate values under recommended operating
conditions.
1. All typical values are at V
CC
= 5 V (unless otherwise noted), Ta = 25C.
2. Measured by the voltage drop between the A and B terminals at the indicated current through the
switch. On-state resistance is determined by the lower voltage of the two (A or B) terminals.
3. This is the increase in supply current for each input that is at the specified TTL voltage level
rather than V
CC
or GND.
Capacitance
(Ta = 25C)
Item Symbol
V
CC
(V)
Min
Typ
Max
Unit
Test conditions
Control input
capacitance
C
IN
5.0
3 pF V
IN
= 0 or 3 V
Input / output
capacitance
C
I/O (OFF)
5.0
5 pF V
O
= 0 or 3 V
OE = V
CC
Note: This parameter is determined by device characterization is not production tested.
HD74CBT1G125
Rev.0, Jan. 2002, page 5 of 9
Switching Characteristics
(Ta =
-40 to 85C)
V
CC
= 4.0 V
Item
Symbol
Min
Max
Unit
Test
conditions
FROM
(Input)
TO
(Output)
Propagation delay
time
*1
t
PLH
t
PHL
0.35
ns
C
L
= 50 pF
R
L
= 500
A or B
B or A
Enable time
t
ZH
t
ZL
5.5 ns
C
L
= 50 pF
R
L
= 500
OE
A or B
t
HZ
4.5
Disable time
t
LZ
4.5
ns C
L
= 50 pF
R
L
= 500
OE
A or B
V
CC
= 5.0
0.5 V
Item
Symbol
Min
Max
Unit
Test
conditions
FROM
(Input)
TO
(Output)
Propagation delay
time
*1
t
PLH
t
PHL
0.25
ns
C
L
= 50 pF
R
L
= 500
A or B
B or A
Enable time
t
ZH
t
ZL
1.6 4.9 ns
C
L
= 50 pF
R
L
= 500
OE
A or B
t
HZ
1.0
4.2
Disable time
t
LZ
1.0
4.8
ns C
L
= 50 pF
R
L
= 500
OE
A or B
Note: 1. The propagation delay is the calculated RC time constant of the typical on-state resistance of the
switch and the specified load capacitance, when driven by an ideal voltage source (zero output
impedance).
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