SN74CB3T16211_07 Datasheet, PDF (2/15 Pages) Texas Instruments – 24-BIT FET SWITCH 2.5-V/3.3-V LOW-VOLTAGE BUS SWITCH WITH 5-V-TOLERANT LEVEL SHIFTER

SN74CB3T16211
24ĆBIT FET BUS SWITCH
2.5ĆV/3.3ĆV LOWĆVOLTAGE BUS SWITCH WITH 5ĆVĆTOLERANT LEVEL SHIFTER
SCDS147B − OCTOBER 2003 − REVISED JANUARY 2005
description/ordering information (continued)
VCC
5.5 V
VCC
≈VCC − 1 V
IN
OUT
CB3T
≈VCC
≈VCC − 1 V
0V
Input Voltages
0V
Output Voltages
NOTE A: If the input high-voltage (VIH) level is greater than or equal to VCC − 1 V and less than or equal to 5.5 V, the output high-voltage (VOH)
level is equal to approximately the VCC voltage level.
Figure 1. Typical DC Voltage-Translation Characteristics
The I/O port of this device has a pullup current source that maintains the output voltage at V_CC when the device
is ON and the input is greater than or equal to V_CC − 1. Because of the pullup current source, the output voltage
level may be less than V_CC when the operating frequency is low and the I/O port is connected to a pulldown
resistor. In order to maintain the output voltage at V_CC, a pullup resistor must be connected to V_CC, instead of
a pulldown resistor to ground.
The SN74CB3T16211 is organized as two 12-bit bus switches with separate output-enable (1OE, 2OE) inputs.
It can be used as two 12-bit bus switches or as one 24-bit bus switch. When OE is low, the associated 12-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 12-bit bus switch is OFF, and a 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
TA
PACKAGE†
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
SSOP − DL
Tube
SN74CB3T16211DL
Tape and reel SN74CB3T16211DLR
CB3T16211
−40°C to 85°C
Tube
SN74CB3T16211DGG
TSSOP − DGG
Tape and reel SN74CB3T16211DGGR
CB3T16211
TVSOP − DGV Tape and reel SN74CB3T16211DGVR KR211
VFBGA − ZQL
(PB-Free)
Tape and reel SN74CB3T16211ZQLR
KR211
† _{Package drawings, standard packing quantities, thermal data, symbolization, and PCB design}
guidelines are available at www.ti.com/sc/package.
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