1
INDUSTRIAL TEMPERATURE RANGE
IDT74CBTLV16212
LOW-VOLTAGE 24-BIT BUS EXCHANGE SWITCH
AUGUST 2002
2002 Integrated Device Technology, Inc.
DSC-5889/3
c
INDUSTRIAL TEMPERATURE RANGE
APPLICATIONS:
3.3V High Speed Bus Switching and Bus Isolation
FEATURES:
5
A/B bi-directional 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, TSSOP, and TVSOP packages
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
IDT74CBTLV16212
PRELIMINARY
FUNCTIONAL BLOCK DIAGRAM
SIMPLIFIED SCHEMATIC, EACH
SWITCH
LOW-VOLTAGE 24-BIT
BUS EXCHANGE SWITCH
DESCRIPTION:
The CBTLV16212 provides a set of 24 high-speed switches for bus
exchanging and switching. The device has low ON resistance, resulting
in under 250ps propagation delay through the switch. The CBTLV16212
operates as a single 24-bit bus switch or as a 12-bit bus exchanger, which
provides data exchanging between the four signal ports through the data
select (S
0
-S
2
) pins.
The CBTLV16212 has the break-before-make feature, which allows
zero current when switching between ports B1 and B2.
SW
SW
SW
SW
SW
SW
SW
SW
S
0
S
1
S
2
1
56
55
1
A
1
1
A
2
12
A
1
12
A
2
2
3
27
28
1
B
1
1
B
2
12
B
1
12
B
2
54
53
30
29
FLOW CONTROL
CIRCUITRY
A
B
2
INDUSTRIAL TEMPERATURE RANGE
IDT74CBTLV16212
LOW-VOLTAGE 24-BIT BUS EXCHANGE SWITCH
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
Description
Max.
Unit
V
CC
Supply Voltage Range
0.5 to 4.6
V
V
I
Input Voltage Range
0.5 to 4.6
V
Continuous Channel Current
128
mA
I
IK
Input Clamp Current, V
I/O
< 0
50
mA
T
STG
Storage Temperature Range
65 to +150
C
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 CONFIGURATION
OPERATING CHARACTERISTICS
(1)
Symbol
Parameter
Test Conditions
Min.
Max.
Unit
V
CC
Supply Voltage
2.3
3.6
V
V
IH
High-Level Control Input Voltage
V
CC
= 2.3V to 2.7V
1.7
--
V
V
CC
= 2.7V to 3.6V
2
--
V
IL
Low-Level Control Input Voltage
V
CC
= 2.3V to 2.7V
--
0.7
V
V
CC
= 2.7V to 3.6V
--
0.8
T
A
Operating Free-Air Temperature
40
+85
C
NOTE:
1. All unused control inputs of the device must be held at V
CC
or GND to ensure proper device operation.
SSOP/ TSSOP/ TVSOP
TOP VIEW
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
S1
S2
1B1
1B2
2B1
2B2
3B1
GND
3B2
4B1
4B2
5B1
5B2
6B1
6B2
7B1
7B2
8B1
GND
8B2
9B1
9B2
10B1
10B2
11B1
11B2
12B1
12B2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
S0
1A1
1A2
2A1
2A2
3A1
3A2
GND
4A1
4A2
5A1
5A2
6A1
6A2
7A1
7A2
V
CC
8A1
GND
8A2
9A1
9A2
10A1
10A2
11A1
11A2
12A1
12A2
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
Z = High-Impedance
FUNCTION TABLE
(1)
Pin Names
Description
S x
Data Select
xAx
Port A Inputs or Outputs
xBx
Port B Inputs or Outputs
PIN DESCRIPTION
Inputs
Inputs/Outputs
S
2
S
1
S
0
A
1
A
2
Operation
L
L
L
Z
Z
Disconnect
L
L
H
B
1
Z
A
1
port = B
1
port
L
H
L
B
2
Z
A
1
port = B
2
port
L
H
H
Z
B
1
A
2
port = B
1
port
H
L
L
Z
B
2
A
2
port = B
2
port
H
L
H
Z
Z
Disconnect
H
H
L
B
1
B
2
A
1
port = B
1
port
A
2
port = B
2
port
H
H
H
B
2
B
1
A
1
port = B
2
port
A
2
port = B
1
port
3
INDUSTRIAL TEMPERATURE RANGE
IDT74CBTLV16212
LOW-VOLTAGE 24-BIT BUS EXCHANGE SWITCH
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Operating Condition: T
A
= 40C to +85C
NOTES:
1. Typical values are at 3.3V, +25C ambient.
2. The increase in supply current is attributable to each input that is at the specified voltage level rather than V
CC
or GND.
3. This is measured by the voltage drop between the A and B terminals at the indicated current through the switch.
Symbol
Parameter
Test Conditions
Min.
Typ.
(1)
Max.
Unit
V
IK
Control Inputs, Data I/O
V
CC
= 3V, I
I
= 18mA
--
--
1.2
V
I
I
Control Inputs
V
CC
= 3.6V, V
I
= V
CC
or GND
--
--
1
A
I
OZ
Data I/O
V
CC
= 3.6V, V
O
= 0V or 3.6V switch disabled
--
--
5
A
I
OFF
V
CC
= 0V, V
I
or V
O
= 0V or 3.6V
--
--
10
A
I
CC
V
CC
= 3.6V, I
O
= 0, V
I
= V
CC
or GND
--
--
10
A
I
CC(2)
Control Inputs
V
CC
= 3.6V, one input at 3V, other inputs at V
CC
or GND
--
--
300
A
C
I
Control Inputs
V
I
= 3V or 0
--
5
--
pF
C
IO(OFF)
V
O
= 3V or 0 (switch off)
--
13.5
--
pF
Max. at V
CC
= 2.3V
V
I
= 0
I
O
= 64mA
--
5
8
Typ. at V
CC
= 2.5V
I
O
= 24mA
--
5
8
R
ON(3)
V
I
= 1.7V
I
O
= 15mA
--
27
40
V
I
= 0
I
O
= 64mA
--
5
7
V
CC
= 3V
I
O
= 24mA
--
5
7
V
I
= 2.4V
I
O
= 15mA
--
10
15
V
CC
= 2.5V 0.2V
V
CC
= 3.3V 0.3V
Symbol
Parameter
Min.
Max.
Min.
Max.
Unit
t
PD(1)
Propagation Delay
--
0.15
--
0.25
ns
A to B or B to A
t
PD
Propagation Delay
3
11.1
3
8.8
ns
S to A or B
t
EN
Output Enable Time
3
10.9
3
8.6
ns
S to A or B
t
DIS
Output DisableTime
1
8.7
2
8.8
ns
S to 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 impededance).
SWITCHING CHARACTERISTICS
4
INDUSTRIAL TEMPERATURE RANGE
IDT74CBTLV16212
LOW-VOLTAGE 24-BIT BUS EXCHANGE SWITCH
Open
V
LOAD
GND
V
CC
Pulse
Generator
D.U.T.
500
500
C
L
R
T
V
IN
V
OUT
(1, 2)
SAME PHASE
INPUT TRANSITION
OPPOSITE PHASE
INPUT TRANSITION
0V
0V
V
OH
V
OL
t
PLH
t
PHL
t
PHL
t
PLH
OUTPUT
V
IH
V
T
V
T
V
IH
V
T
CONTROL
INPUT
t
PLZ
0V
OUTPUT
NORMALLY
LOW
t
PZH
0V
SWITCH
CLOSED
OUTPUT
NORMALLY
HIGH
ENABLE
DISABLE
SWITCH
OPEN
t
PHZ
0V
V
OL +
V
LZ
V
OH
V
T
V
T
t
PZL
V
LOAD/2
V
LOAD/2
V
IH
V
T
V
OL
V
OH -
V
HZ
TEST CIRCUITS AND WAVEFORMS
Propagation Delay
Test Circuits for All Outputs
Enable and Disable Times
NOTE:
1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH.
DEFINITIONS:
C
L
= Load capacitance: includes jig and probe capacitance.
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.
Test
Switch
t
PLZ
/t
PZL
V
LOAD
t
PHZ
/t
PZH
GND
t
PD
Open
SWITCH POSITION
Symbol
V
CC(1)
= 3.3V0.3V
V
CC(2)
= 2.5V0.2V
Unit
V
LOAD
6
2 x Vcc
V
V
IH
3
Vcc
V
V
T
1.5
Vcc
/ 2
V
V
LZ
300
150
mV
V
HZ
300
150
mV
C
L
50
30
pF
TEST CONDITIONS
5
INDUSTRIAL TEMPERATURE RANGE
IDT74CBTLV16212
LOW-VOLTAGE 24-BIT BUS EXCHANGE SWITCH
ORDERING INFORMATION
CORPORATE HEADQUARTERS
for SALES:
for Tech Support:
2975 Stender Way
800-345-7015 or 408-727-6116
logichelp@idt.com
Santa Clara, CA 95054
fax: 408-492-8674
(408) 654-6459
www.idt.com
IDT
XX
CBTLV
XXX
XX
Package
Device Type
Temp. Range
PV
PA
PF
74
Shrink Small Outline Package
Thin Shrink Small Outline Package
Thin Very Small Outline Package
Low-Voltage 24-Bit Bus Exchange Switch
40C to +85C
16212
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