IDT74FST163245 Datasheet, PDF (1/6 Pages) Integrated Device Technology – 16-BIT BUS SWITCH

16-BIT BUS SWITCH
IDT74FST163245
IDT74FST163P245
ADVANCE INFORMATION
Integrated Device Technology, Inc.
FEATURES:
• Bus switches provide zero delay paths
• Extended commercial range of –40°C to +85°C
• Low switch on-resistance:
FST163xxx – 5Ω
FST163Pxxx – 5Ω with precharge
• TTL-compatible input and output levels
• ESD > 2000V per MIL-STD-883, Method 3015;
> 200V using machine model (C = 200pF, R = 0)
• Available in SSOP, TSSOP and TVSOP
DESCRIPTION:
The FST163245/163P245 belong to IDT's family of Bus
switches. Bus switch devices perform the function of connect-
ing or isolating two ports without providing any inherent
current sink or source capability. Thus they generate little or
no noise of their own while providing a low resistance path for
an external driver. These devices connect input and output
ports through an n-channel FET. When the gate-to-source
junction of this FET is adequately forward-biased the device
conducts and the resistance between input and output ports
is small. Without adequate bias on the gate-to-source junction
of the FET, the FET is turned off, therefore with no VCC
applied, the device has hot insertion capability.
The low on-resistance and simplicity of the connection
between input and output ports reduces the delay in this path
to close to zero.
The FST163245 and FST163P245 are 16-bit TTL-compat-
ible bus switches. The OE pins provide enable control. The
FST163P245 supports precharge on the B port. So when OE
is high, A and B ports are isolated and B outputs are precharged
to the bias voltage through the equivalent of a 10KΩ resistor
(1B1-8 precharged to VBIAS1 and 2B1-8 precharged to VBIAS1).
FUNCTIONAL BLOCK DIAGRAM
VBIAS1
1A1
1A1
1B1
1A8
1A8
1B8
1B1
1B8
VBIAS1
2A1
2B1
2A1
2B1
2A8
2B8
1OE
2OE
FST163245
PIN DESCRIPTION
Pin Names
1A1-8, 2A1-8
I/O
Description
I/O Bus A
1B1-8, 2B1-8
1OE, 2OE
I/O Bus B
I
Bus Switch Enable (Active LOW)
VBIAS1
I
Precharge Reference Voltage
3513 tbl 01
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
COMMERCIAL TEMPERATURE RANGE
©1997 Integrated Device Technology, Inc.
1
2A8
1OE
2OE
2B8
FST163P245
3513 drw 01
FEBRUARY 1997
DSC-3513/-