INDUSTRIAL TEMPERATURE RANGE
74CBTLV3257
LOW-VOLTAGE QUAD 2:1 MUX/DEMUX BUS SWITCH
1MAY 2019INDUSTRIAL TEMPERATURE RANGE
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
© 2019 Integrated Device Technology, Inc. DSC-5744/6
FUNCTIONAL BLOCK DIAGRAM
FEATURES:
• Functionally equivalent to QS3257
•5
ΩΩ
ΩΩ
Ω bi-directional switch connection between two ports
• 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 QSOP and TSSOP packages
74CBTLV3257
LOW-VOLTAGE
QUAD 2:1MUX/DEMUX
BUS SWITCH
FROM ENABLE
CIRCUITRY
AB
1A
1B2
2B2
3B2
4A
SW
SW
SW
SW
SW
SW
SW
1B1
2B1
3B1
2A
3A
4B2
4B1
S
OE
SW
DESCRIPTION:
The CBTLV3257 is a quad 2:1 multiplexer/demultiplexer. The low on-
state resistance of the switch allows connections to be made with minimal
propagation delay.
The select (S) input controls the data flow. The multiplexers/demultiplexers
are enabled when the output-enable (OE) input is low.
To ensure the high-impedance state during power up or power down,
OE should be tied to VCC through a pullup resistor; the minimum value of
the resistor is determined by the current-sinking capability of the driver.
SIMPLIFIED SCHEMATIC, EACH
SWITCH
APPLICATIONS:
• 3.3V High Speed Bus Switching, Multiplexing, and Bus Isolation
INDUSTRIAL TEMPERATURE RANGE
2
74CBTLV3257
LOW-VOLTAGE QUAD 2:1 MUX/DEMUX BUS SWITCH
PIN CONFIGURATION
TOP VIEW
Symbol Parameter Test Conditions Min. Max. Unit
VCC Supply Voltage 2.3 3.6 V
VIH High-Level Control Input Voltage VCC = 2.3V to 2.7V 1 . 7 — V
VCC = 2.7V to 3.6V 2 —
VIL Low-Level Control Input Voltage VCC = 2.3V to 2.7V — 0. 7 V
VCC = 2.7V to 3.6V — 0. 8
TAOperating Free-Air Temperature −40 85 °C
OPERATING CHARACTERISTICS, TA = 25°C(1)
NOTE:
1. All unused control inputs of the device must be held at VCC or GND to ensure proper device operation.
Symbol Description Max Unit
VCC SupplyVoltage Range –0.5 to +4.6 V
VIInput Voltage Range –0.5 to +4.6 V
Continuous Channel Current 128 mA
IIK Input Clamp Current, VI/O < 0 –50 mA
TSTG Storage Temperature –65 to +150 °C
ABSOLUTE MAXIMUM RATINGS(1)
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.
VCC
S
4B1
1B2
4B2
1A
4A
2B1
3B1
2B2
3B2
2A
1B1 OE
GND 3A
161
314
413
512
611
710
215
9
8
NOTE:
1 . H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care
Inputs
OE S Function
L L A Port = B1 Port
L H A Port = B2 Port
H X Disconnect
FUNCTION TABLE(1)
Package Type Package Code Order Code
TSSOP PGG16 PGG
QSOP PCG16 QG
INDUSTRIAL TEMPERATURE RANGE
74CBTLV3257
LOW-VOLTAGE QUAD 2:1 MUX/DEMUX BUS SWITCH
3
Symbol Parameter Test Conditions Min. Typ.(1) Max. Unit
VIK Control Inputs, Data Inputs VCC = 3V, II = –18mA — — –1.2 V
IIControl Inputs VCC = 3.6V, VI = V CC or GND — — ±1µA
IOZ Data I/O VCC = 3.6V, VO = 0 or 3.6V, switch disabled — — 20 µA
IOFF VCC = 0, VI or VO = 0 to 3.6V — — 50 µA
ICC VCC = 3.6V, IO = 0, VI = VCC or GND — — 10 µA
ΔICC(2) Control Inputs VCC = 3.6V, one input at 3V, other inputs at VCC or GND — — 300 µA
CIControl Inputs VI = 3V or 0 — 4 — pF
CIO(OFF) A Port VO = 3V or 0, OE = VCC = 3.3V — 13 — pF
B Port —6—
VCC = 2.3V VI = 0 IO = 64mA — 5 8
Typ. at VCC = 2.5V IO = 24mA — 5 8
RON(3) VI = 1.7V IO = 15mA — 27 40 Ω
VI = 0 IO = 64mA — 5 7
VCC = 3V IO = 24mA — 5 7
VI = 2.4V IO = 15mA — 10 15
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Operating Conditions: TA = –40°C to +85°C
VCC = 2.5V ± 0.2V VCC = 3.3V ± 0.3V
Symbol Parameter Min. Max. Min. Max. Unit
tPD(1) Propagation Delay −0.15 −0.25 ns
A to B or B to A
tSEL Select Time 1 6.1 1 5.3 ns
S to A or B
tEN Enable Time 1 6.1 1 5.3 ns
S to B
tDIS Disable Time 1 4.8 1 4.5 ns
S to B
tEN Output Enable Time 1 5.6 1 5 ns
OE to A or B
tDIS Output Disable Time 1 5.5 1 5.5 ns
OE 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 driven by an ideal voltage source
(zero output impedance).
SWITCHING CHARACTERISTICS
NOTES:
1. Typical values are at VCC = 3.3V, +25°C ambient.
2. The increase in supply current is attributable to each current that is at the specified voltage level rather than VCC or GND.
3. This is 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 of the voltages
of the two (A or B ) terminals.
INDUSTRIAL TEMPERATURE RANGE
4
74CBTLV3257
LOW-VOLTAGE QUAD 2:1 MUX/DEMUX BUS SWITCH
Open
VLOAD
GND
VCC
Pulse
Generator D.U.T.
500Ω
500Ω
CL
RT
VIN VOUT
(1, 2)
SAME PHASE
INPUT TRANSITION
OPPOSITE PHASE
INPUT TRANSITION
0V
0V
VOH
VOL
tPLH tPHL
tPHL
tPLH
OUTPUT
VIH
VT
VT
VIH
VT
CONTROL
INPUT
tPLZ 0V
OUTPUT
NORMALLY
LOW tPZH
0V
SWITCH
CLOSED
OUTPUT
NORMALLY
HIGH
ENABLE DISABLE
SWITCH
OPEN
tPHZ
0V
VOL + VLZ
VOH
VT
VT
tPZL
VLOAD/2 VLOAD/2
VIH
VT
VOL
VOH -VHZ
TEST CIRCUITS AND WAVEFORMS
Test Circuits for All Outputs Enable and Disable Times
Propagation Delay
NOTES:
1. Pulse Generator for All Pulses: Rate ≤ 10MHz; tF ≤ 2.5ns; tR ≤ 2.5ns.
2. Pulse Generator for All Pulses: Rate ≤ 10MHz; tF ≤ 2ns; tR ≤ 2.5ns.
DEFINITIONS:
CL = Load capacitance: includes jig and probe capacitance.
RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.
Symbol VCC(1)= 3.3V±0.3V VCC(2)= 2.5V±0.2V Unit
VLOAD 6 2 x Vcc V
VIH 3 Vcc V
VT1.5 Vcc / 2 V
VLZ 300 150 mV
VHZ 300 150 mV
CL50 30 pF
TEST CONDITIONS
Test Switch
tPLZ/tPZL VLOAD
tPHZ/tPZH GND
tSEL Open
tPD Open
SWITCH POSITION
INDUSTRIAL TEMPERATURE RANGE
74CBTLV3257
LOW-VOLTAGE QUAD 2:1 MUX/DEMUX BUS SWITCH
5
ORDERING INFORMATION
CORPORATE HEADQUARTERS for SALES: for Tech Support:
6024 Silver Creek Valley Road 800-345-7015 or 408-284-8200 logichelp@idt.com
San Jose, CA 95138 fax: 408-284-2775
www.idt.com
XX CBTLV XXX XX
Package
Device Type
Temp. Range
Q
PG
74
Quarter-Size Small Outline Package (PCG16)
Thin Shrink Small Outline Package (PGG16)
Low-Voltage Quad 2:1 Mux/Demux Bus Switch
–40°C to +85°C
3257
Blank
8
X
Tube
Tape and Reel
Green
G
X
Datasheet Document History
12/18/2014 Pg. 5 Updated the ordering information by removing non RoHS part and by adding Tape and Reel information.
05/10/2019 Pg. 2,5 Added table under pin configuration diagram with detailed package information and orderable part information table.
Updated the ordering information diagram in clearer detail.
Speed
(ns) Orderable Part ID Pkg.
Code Pkg.
Type Temp.
Grade
74CBTLV3257PGG PGG16 TSSOP I
74CBTLV3257PGG8 PGG16 TSSOP I
74CBTLV3257QG PCG16 QSOP I
74CBTLV3257QG8 PCG16 QSOP I
Orderable Part Information
