Datasheet

www.ti.com
DESCRIPTION/ORDERING INFORMATION
SN74CB3Q16244
16-BIT FET BUS SWITCH
2.5-V/3.3-V LOW-VOLTAGE HIGH-BANDWIDTH BUS SWITCH
SCDS168 – MAY 2004 – REVISED MARCH 2005
The SN74CB3Q16244 is a high-bandwidth FET bus switch utilizing a charge pump to elevate the gate voltage of
the pass transistor, providing a low and flat ON-state resistance (r
on
). The low and flat ON-state resistance allows
for minimal propagation delay and supports rail-to-rail switching on the data input/output (I/O) ports. The device
also features low data I/O capacitance to minimize capacitive loading and signal distortion on the data bus.
Specifically designed to support high-bandwidth applications, the SN74CB3Q16244 provides an optimized
interface solution ideally suited for broadband communications, networking, and data-intensive computing
systems.
The SN74CB3Q16244 is organized as four 4-bit bus switches with separate output-enable (1 OE, 2 OE, 3 OE,
4 OE) inputs. It can be used as four 4-bit bus switches, two 8-bit bus switches, or one 16-bit bus switch. When
OE is low, the associated 4-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 4-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
circuitry prevents damaging
current 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)
ORDERABLE PART NUMBER TOP-SIDE MARKING
Tube SN74CB3Q16244DL
SSOP – DL CB3Q16244
Tape and reel SN74CB3Q16244DLR
–40 ° C to 85 ° C Tube SN74CB3Q16244DGG
TSSOP – DGG CB3Q16244
Tape and reel SN74CB3Q16244DGGR
TVSOP – DGV Tape and reel SN74CB3Q16244DGVR BW244
(1) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
FUNCTION TABLE
(EACH 4-BIT BUS SWITCH)
INPUT INPUT/OUTPUT
FUNCTION
OE A
L B A port = B port
H Z Disconnect
2