IDT74CBTLV3244
LOW-VOLTAGE OCTAL BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
LOW-VOLTAGE OCTAL
BUS SWITCH
IDT74CBTLV3244
FEATURES:
–
–
–
–
–
–
–
–
Pin-out compatible with standard '244 logic
5Ω A/B bidirectional switch
Isolation Under Power-Off Conditions
Over-voltage tolerant
Latch-up performance exceeds 100mA
V
CC
= 2.3V - 3.6V, Normal Range
ESD > 2000V per MIL-STD-883, Method 3015;
> 200V using machine model (C = 200pF, R = 0)
Available in SSOP, QSOP, and TSSOP packages
DESCRIPTION:
The octal bus switch has standard 244 pinouts. The CBTLV3244 is
designed for asynchronous communication between data buses. Sets of
four switches are controlled by one output Enable (OE). When
OE
is low,
the set of four bus switches is on and port A is connected to port B. When
OE
is high, the set of four bus switches is off and a high impedance exists
between port A and port B.
To ensure the high-impedance state during power up or power down,
both
OEs
should be tied to V
CC
through a pullup resistor.
APPLICATIONS:
– 3.3V High Speed Bus Switching and Bus Isolation
FUNCTIONAL BLOCK DIAGRAM
2
1A1
SW
18
1B1
SIMPLIFIED SCHEMATIC, EACH
SWITCH
8
1A4
SW
12
1B4
A
B
1
1OE
OE
11
2A1
SW
9
2B1
17
2A4
SW
3
2B4
19
2OE
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
1
c
2001
Integrated Device Technology, Inc.
SEPTEMBER 2001
DSC-5393/2
IDT74CBTLV3244
LOW-VOLTAGE OCTAL BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
Symbol
V
CC
V
I
Description
Supply Voltage Range
Input Voltage Range
Continuous Channel Current
I
IK
Input Clamp Current, , V
I/O
< 0
Storage Temperature
T
STG
Max.
–0.5 to 4.6
–0.5 to 4.6
128
–50
(1)
Unit
V
V
mA
mA
°C
1OE
1
A
1
2
B
4
1
A
2
2
B
3
1
A
3
2
B
2
1
A
4
2
B
1
1
2
3
4
5
6
7
8
9
10
20
19
18
17
SO20-7
SO20-8 16
SO20-9
15
14
13
12
11
V
CC
2OE
1
B
1
2
A
4
1
B
2
2
A
3
1
B
3
2
A
2
1
B
4
2
A
1
–65 to +150
NOTE:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM
RATINGS may cause permanent damage to the device. This is a
stress rating only and functional operation of the device at these or
any other conditions above those indicated in the operational sections
of this specification is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect reliability.
PIN DESCRIPTION
Pin Names
x
OE
Ax
Bx
Description
Output Enable (Active LOW)
Port A Inputs or Outputs
Port B Inputs or Outputs
GND
SSOP/ TSSOP/ QSOP
TOP VIEW
FUNCTION TABLE
Input
1OE
H
L
H
L
2OE
H
H
L
L
(1)
2A, 2B I/Os
Disconnect
Disconnect
2A Port = 2B Port
2A Port = 2B Port
1A, 1B I/Os
Disconnect
1A Port = 1B Port
Disconnect
1A Port = 1B Port
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
OPERATING CHARACTERISTICS, T
A
= 25ºC
Symbol
V
CC
V
IH
V
IL
T
A
Parameter
Supply Voltage
High-Level Control Input Voltage
Low-Level Control Input Voltage
Operating Free-Air Temperature
V
CC
= 2.3V to 2.7V
V
CC
= 2.7V to 3.6V
V
CC
= 2.3V to 2.7V
V
CC
= 2.7V to 3.6V
Test Conditions
Min.
2.3
1.7
2
—
—
−40
Max.
3.6
—
—
0.7
0.8
85
°C
V
Unit
V
V
NOTE:
1. All unused control inputs must be held at V
CC
or GND to ensure proper device operation.
2
IDT74CBTLV3244
LOW-VOLTAGE OCTAL BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Operating Condition: T
A
= – 40°C to +85°C
Symbol
V
IK
I
I
I
OZ
I
OFF
I
CC
∆I
CC (1)
C
I
C
IO(OFF)
Max at V
CC
= 2.3V
Typ at V
CC
= 2.5V
R
ON
(2)
Parameter
Control Inputs, Data I/O
Control Inputs, Data I/O
Data I/O
Test Conditions
V
CC
= 3V, I
I
=
−18mA
V
CC
= 3.6V, V
I
= V
CC
or GND
V
CC
= 3.6V, V
O
= 0 or 3.6V, switch disabled
V
CC
= 0, V
I
or V
O
= 0 to 3.6V
V
CC
= 3.6V, I
O
= 0, V
I
= V
CC
or GND
Min.
—
—
—
—
—
—
—
—
Typ.
—
—
—
—
—
—
4
6
5
5
27
5
5
10
Max.
– 1.2
±1
5
50
10
300
—
—
8
8
40
7
7
15
Unit
V
µA
µA
µA
µA
µA
pF
pF
Control Inputs
Control Inputs
V
CC
= 3.6V, One input at 3V
,
Other inputs at V
CC
or GND
V
I
= 3V or 0
V
O
= 3V or 0,
OE
= V
CC
V
I
= 0
V
I
= 1.7V
V
I
= 0
I
O
= 64mA
I
O
= 24mA
I
O
= 15mA
I
O
= 64mA
I
O
= 24mA
V
I
= 2.4V
I
O
= 15mA
—
—
—
—
—
—
Ω
V
CC
= 3V
NOTES:
1. The increase in supply current is attributable to each input that is at the specified voltage level rather than V
CC
or GND.
2. This is measured by the voltage drop between the A and B terminals at the indicated current through the switch.
SWITCHING CHARACTERISTICS
V
CC
= 2.5V ± 0.2V
Symbol
t
PD
(1)
t
EN
t
DIS
Parameter
Propagation Delay
A to B or B to A
Output Enable Time
OE
to A or B
Output Disable Time
OE
to A or B
Min.
Max.
0.15
4.5
4.5
V
CC
= 3.3V ± 0.3V
Min.
Max.
0.25
4
5
Unit
ns
ns
ns
1
1
1
1
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).
3
IDT74CBTLV3244
LOW-VOLTAGE OCTAL BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS
TEST CONDITIONS
Symbol
V
LOAD
V
IH
V
T
V
LZ
V
HZ
C
L
V
CC
(1)
= 3.3V ± 0.3V
6
3
1.5
300
300
50
V
CC
(2)
= 2.5V ± 0.2V
2 x Vcc
Vcc
V
CC
/2
150
150
30
Unit
V
V
V
mV
mV
pF
OPPOSITE PHASE
INPUT TRANSITION
OUTPUT
t
PLH
t
PHL
PROPAGATION DELAY
SAME PHASE
INPUT TRANSITION
t
PLH
t
PHL
V
IH
V
T
0V
V
OH
V
T
V
OL
V
IH
V
T
0V
TEST CIRCUITS FOR ALL OUTPUTS
V
CC
500
Ω
Pulse
Generator
(1, 2)
ENABLE AND DISABLE TIMES
ENABLE
DISABLE
CONTROL
INPUT
t
PZL
OUTPUT
SW ITCH
NORMALLY
CLO SED
LOW
t
PZH
OUTPUT
SW ITCH
NORMALLY
OPE N
HIGH
V
LO AD/2
V
T
t
PHZ
V
T
0V
t
PLZ
V
IH
V
T
0V
V
LO AD/2
V
OL +
V
LZ
V
OL
V
OH
V
OH -
V
HZ
0V
V
LO AD
Open
GND
V
IN
D.U.T.
V
OUT
R
T
500
Ω
C
L
DEFINITIONS:
1. C
L
= Load capacitance: includes jig and probe capacitance.
2. R
T
= Termination resistance: should be equal to Z
OUT
of the Pulse
Generator.
NOTES:
1. Pulse Generator for all pulses: Rate
≤
10MHz; t
F
≤
2.5ns; t
R
≤
2.5ns.
2. Pulse Generator for all pulses: Rate
≤
10MHz; t
F
≤
2ns; t
R
≤
2ns.
NOTE:
1. Diagram shown for input control Enable-LOW and input Control
Disable-HIGH.
SWITCH POSITION
Test
t
PLZ
/
t
PZL
t
PHZ/
t
PZH
t
PD
Switch
V
LOAD
GND
Open
4
IDT74CBTLV3244
LOW-VOLTAGE OCTAL BUS SWITCH
INDUSTRIAL TEMPERATURE RANGE
ORDERING INFORMATION
IDT
XX
CBTLV
XXX
Device Type
XX
Package
Tem p. Range
PY
Q
PG
Shrink Small Outline Package (SO20-7)
Quarter-size Sm all Outline Package (SO20-8)
Thin Shrink Sm all Outline Package (SO20-9)
3244
Low-Voltage Octal Bus Switch
74
–40°C to +85°C
CORPORATE HEADQUARTERS
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www.idt.com
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logichelp@idt.com
(408) 654-6459
5
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