FST162245 Datasheet, PDF (1/4 Pages) Fairchild Semiconductor – 16-Bit Bus Switch with 25Ω Series Resistors in Outputs

April 2001
Revised April 2001
FST162245
16-Bit Bus Switch with 25Ω Series Resistors in Outputs
General Description
The Fairchild Switch FST162245 provides 16-bits of high-
speed CMOS TTL-compatible bus switching. The low On
Resistance of the switch allows inputs to be connected to
outputs without adding propagation delay or generating
additional ground bounce noise.
The device is organized as a 16-bit switch. There are two
8-bit switches with separate output enable inputs. When
OE is LOW, the switch is ON and Port a is connected to
Port B. When OE is HIGH, the switch is OFF and a high
impedance state exists between the A and B Ports. The
FST162245 has an equivalent 25Ω series resistors to
reduce signal-reflection noise, eliminating the need for
external terminating resistors.
Features
I 25Ω switch connection between two ports
I Minimal propagation delay through the switch
I Low l_CC
I Zero bounce in flow-through mode
I Control inputs compatible with TTL level
Ordering Code:
Order Number Package Number
Package Description
FST162245MTD
MTD48
48-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Logic Diagram
Pin Descriptions
Pin Name
OE_n
1A_n, 2A_n, 3A_n, 4A_n
1B_n, 2B_n, 3B_n, 4B_n
NC
Description
Output Enable Input (Active LOW)
Bus A
Bus B
No Internal Connection
Truth Table
Inputs
Outputs
OE_x
A, B
L
A Port = B Port
H
Z
H = HIGH Voltage Level L = LOW Voltage Level Z = High Impedance
© 2001 Fairchild Semiconductor Corporation DS500431
www.fairchildsemi.com