Datasheet

SN74CB3T3125
SCDS120B –FEBRUARY 2003–REVISED AUGUST 2012 www.ti.com
DESCRIPTION/ORDERING INFORMATION (CONTINUED)
Figure 1. Typical DC Voltage-Translation Characteristics
The SN74CB3T3125 is organized as four 1-bit bus switches with separate output-enable (1OE, 2OE, 3OE, 4OE)
inputs. It can be used as four 1-bit bus switches or as one 4-bit bus switch. When OE is low, the associated 1-bit
bus switch is ON, and the A port is connected to the B port, allowing bidirectional data flow between ports. When
OE is high, the associated 1-bit bus switch is OFF, and the high-impedance state exists between the A and B
ports.
This device is fully specified for partial-power-down applications using I
off
. The I
off
feature ensures that damaging
current will not backflow through the device when it is powered down. The device has isolation during power off.
To ensure the high-impedance state during power up or power down, OE should be tied to V
CC
through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
ORDERING INFORMATION
T
A
PACKAGE
(1) (2)
ORDERABLE PART NUMBER TOP-SIDE MARKING
QFN – RGY Tape and reel SN74CB3T3125RGYR KS125
Tube SN74CB3T3125PW
–40°C to 85°C TSSOP – PW KS125
Tape and reel SN74CB3T3125PWR
TVSOP – DGV Tape and reel SN74CB3T3125DGVR KS125
(1) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
(2) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
website at www.ti.com.
FUNCTION TABLE
(EACH BUS SWITCH)
INPUT INPUT/OUTPUT
FUNCTION
OE A
L B A port = B port
H Z Disconnect
2 Submit Documentation Feedback Copyright © 2003–2012, Texas Instruments Incorporated
Product Folder Links: SN74CB3T3125