HD74CBT3384A
10-bit FET Bus Switch
ADE-205-652 (Z)
Preliminary
Rev. 0
Jan. 2002
Description
The HD74CBT3384A provides ten bits of high-speed TTL-compatible bus switching. The low on-state
resistance of the switch allows connections to be made with minimal propagation delay.
The device is organized as two 5-bit switches with separate output-enable (OE) inputs. When
OE
is low,
the switch is on, and port A is connected to port B. When
OE
is high, the switch is open, and the high-
impedance state exists between the two ports.
Features
•
Minimal propagation delay through the switch.
•
5
Ω
switch connection between two ports.
•
TTL-compatible input levels.
•
Ultra low quiescent power.
-Ideally suited for notebook applications.
•
Package type
Product code example: HD74CBT3384ATEL
Package type
TSSOP-24pin
Package code
TTP-24DBV
Package suffix
T
Taping code
EL (1,000pcs / Reel)
HD74CBT3384A
Function Table
(Each 5-bit bus switch)
Input
OE
L
H
H:
L:
High level
Low level
Function
A port = B port
Disconnect
Pin Arrangement
1OE 1
1B1 2
1A1 3
1A2 4
1B2 5
1B3
1A3
6
7
24 Vcc
23 2B5
22 2A5
21 2A4
20 2B4
19 2B3
18 2A3
17 2A2
16 2B2
15 2B1
14 2A1
13 2OE
(TOP view)
1A4 8
1B4
9
1B5 10
1A5 11
GND 12
Rev.0, Jan. 2002, page 2 of 10
HD74CBT3384A
Absolute Maximum Ratings
Item
Supply voltage range
Input voltage range
Input clamp current
Continuous output current
Continuous current through
V
CC
or GND
Maximum power dissipation
*2
at Ta = 25°C (in still air)
Storage temperature
Notes:
*1
Symbol
V
CC
V
I
I
IK
I
O
I
CC
or I
GND
P
T
Tstg
Ratings
−0.5
to 7.0
−0.5
to 7.0
−50
128
±100
862
−65
to 150
Unit
V
V
mA
mA
mA
mW
°C
Conditions
V
I
< 0
V
O
= 0 to V
CC
TSSOP
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 150°C.
Recommended Operating Conditions
Item
Supply voltage range
Input voltage range
Output voltage range
Input transition rise or fall rate
Operating free-air temperature
Symbol
V
CC
V
I
V
I/O
∆t
/
∆v
Ta
Min
4.0
0
0
0
−40
Max
5.5
5.5
5.5
5
85
Unit
V
V
V
ns / V
°C
V
CC
= 4.5 to 5.5 V
Conditions
Note: Unused or floating inputs must be held high or low.
Rev.0, Jan. 2002, page 3 of 10
HD74CBT3384A
Block Diagram
1A1
3
2
1B1
1A5
11
10
1B5
1OE
1
2A1
14
15
2B1
2A5
22
23
2B5
2OE
13
Rev.0, Jan. 2002, page 4 of 10
HD74CBT3384A
DC Electrical Characteristics
(Ta =
−40
to 85°C)
Item
Clamp diode voltage
Input voltage
Symbol
V
IK
V
IH
V
IL
On-state switch
*2
resistance
R
ON
V
CC
(V)
4.5
4.0 to 5.5
4.0 to 5.5
4.0
Min
2.0
Typ
14
*1
Max
−1.2
0.8
20
Unit
V
V
Ω
Test conditions
I
IN
=
−18
mA
V
IN
= 2.4 V,
I
IN
= 15 mA
Typ at V
CC
= 4.0 V
V
IN
= 0 V,
I
IN
= 64 mA
V
IN
= 0 V,
I
IN
= 30 mA
V
IN
= 2.4 V,
I
IN
= 15 mA
4.5
4.5
4.5
Input current
Off-state leakage
current
Quiescent supply
current
Increase in I
CC
*3
per input
Notes:
I
IN
I
OZ
I
CC
∆I
CC
0 to 5.5
5.5
5.5
5.5
5
5
10
7
7
15
±1.0
±1.0
3
2.5
µA
µA
µA
mA
V
IN
= 5.5 V or GND
0
≤
A, B
≤
V
CC
V
IN
= V
CC
or GND,
I
O
= 0 mA
One input at 3.4 V,
other inputs at V
CC
or
GND
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 = 25°C.
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 = 25°C)
Item
Control input
capacitance
Input / output
capacitance
Symbol
C
IN
C
I/O (OFF)
V
CC
(V)
5.0
5.0
Min
Typ
3
5
Max
Unit
pF
pF
Test conditions
V
IN
= 0 or 3 V
V
O
= 0 or 3 V
OE
= V
CC
Note: This parameter is determined by device characterization is not production tested.
Rev.0, Jan. 2002, page 5 of 10
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