FSTU162450MTD Datasheet PDF - Fairchild Semiconductor
| Part Number | FSTU162450MTD | |
| Description | Configurable 4-Bit to 20-Bit Bus Switch with .2V Undershoot Protection and 25 Series Resistors in Outputs (Preliminary) | |
| Manufacturers | Fairchild Semiconductor | |
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Preliminary
February 2001
Revised August 2001
FSTU162450
Configurable 4-Bit to 20-Bit Bus Switch with
−2V Undershoot Protection
and 25Ω Series Resistors in Outputs (Preliminary)
General Description
The Fairchild Universal Bus Switch FSTU162450 provides
4-bit, 5-bit, 8-bit, 10-bit, 16-bit, 20-bit 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 FSTU162450 is designed to allow “customer” configu-
ration control of the enable connections. The device can be
organized as either a five 4-bit, four 5-bit, two 10-bit or one
20-bit enable bus switch. Also achieveable are 8-bit and
16-bit enabled configurations (see Functional Description).
The device’s bit configuration is controlled through select
pin logic. (see Truth Table). When OEx is LOW, Port Ax is
connected to Port Bx. When OEx is HIGH, the switch is
OPEN.
The A and B Ports are protected against undershoot to
support an extended range to 2.0V below ground.
Fairchild’s integrated Undershoot Hardened Circuit
(UHC) senses undershoot at the I/O and responds by
preventing voltage differentials from developing and turn-
ing the switch on.
Features
s Undershoot protected to −2V (A and B Ports)
s 25Ω switch connection between two ports
s Minimal propagation delay through the switch
s Low lCC
s Zero bounce in flow-through mode
s Control inputs compatible with TTL level
s See Applications Notes AN-5008 and AN-5021
for UHC details
s Also packaged in plastic Fine-Pitch Ball Grid Array
(FBGA) (Preliminary)
Applications Note
Select pins S0, S1, S2 are intended to be used as static
user configurable control pins. The AC performance of
these pins has not been characterized or tested. Switching
of these select pins during system operation may tempo-
rarily disrupt output logic states and/or enable pin controls.
Ordering Code:
Order Number Package Number
Package Description
FSTU162450GX
(Note 1)
BGA54A
(Preliminary)
54-Ball Fine-Pitch Ball Grid Array (FBGA), JEDEC MO-205, 5.5mm Wide
[Tape and Reel]
FSTU162450MTD
(Note 2)
MTD56
56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Note 1: BGA package available in Tape and Reel only.
Note 2: Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
UHC is a trademark of Fairchild Semiconductor Corporation.
© 2001 Fairchild Semiconductor Corporation DS500423
www.fairchildsemi.com
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Preliminary
Truth Tables (Continued)
4-Bit Configuration (S0 = S1 = H)
Inputs
OE1 OE2 OE3 OE4 OE5
LLLLL
L L L LH
L L LHL
L L LHH
L LHL L
L LHLH
L LHHL
L LHHH
LHL L L
LHLLH
LHLHL
LH LHH
LHHL L
L HH L H
L HHH L
L HHHH
HL L L L
HL L LH
HL LHL
H L LHH
HLHL L
HLHLH
H L HH L
H LHHH
HHL L L
HHL LH
HH L H L
HH LHH
HHHL L
HHH L H
HHHHL
HHHHH
1A1-4, 1B1-4
1Ax = 1Bx
1Ax = 1Bx
1Ax = 1Bx
1Ax = 1Bx
1Ax = 1Bx
1Ax = 1Bx
1Ax = 1Bx
1Ax = 1Bx
1Ax = 1Bx
1Ax = 1Bx
1Ax = 1Bx
1Ax = 1Bx
1Ax = 1Bx
1Ax = 1Bx
1Ax = 1Bx
1Ax = 1Bx
Z
Z
Z
Z
Z
Z
Z
Z
Z
Z
Z
Z
Z
Z
Z
Z
Inputs/Outputs
1A5-8, 1B5-8
2A3-6, 2B3-6
2A7-10, 2B7-10
1A9-10, 2B9-10
2A1-2, 2B1-2
1Ay = 1By
1Ay = 1By
1Ay = 1By
1Ay = 1By
1Ay = 1By
1Ay = 1By
1Ay = 1By
1Ay = 1By
Z
Z
Z
Z
Z
Z
Z
Z
2Ax = 2Bx
2Ax = 2Bx
2Ax = 2Bx
2Ax = 2Bx
Z
Z
Z
Z
2Ax = 2Bx
2Ax = 2Bx
2Ax = 2Bx
2Ax = 2Bx
Z
Z
Z
Z
2Ay = 2By
2Ay = 2By
Z
Z
2Ay = 2By
2Ay = 2By
Z
Z
2Ay = 2By
2Ay = 2By
Z
Z
2Ay = 2By
2Ay = 2By
Z
Z
1Az = 1Bz
2Az = 2Bz
Z
1Az = 1Bz
2Az = 2Bz
Z
1Az = 1Bz
2Az = 2Bz
Z
1Az = 1Bz
2Az = 2Bz
Z
1Az = 1Bz
2Az = 2Bz
Z
1Az = 1Bz
2Az = 2Bz
Z
1Az = 1Bz
2Az = 2Bz
Z
1Az = 1Bz
2Az = 2Bz
Z
1Ay = 1By
1Ay = 1By
1Ay = 1By
1Ay = 1By
1Ay = 1By
1Ay = 1By
1Ay = 1By
1Ay = 1By
Z
Z
Z
Z
Z
Z
Z
Z
2Ax = 2Bx
2Ax = 2Bx
2Ax = 2Bx
2Ax = 2Bx
Z
Z
Z
Z
2Ax = 2Bx
2Ax = 2Bx
2Ax = 2Bx
2Ax = 2Bx
Z
Z
Z
Z
2Ay = 2By
2Ay = 2By
Z
Z
2Ay = 2By
2Ay = 2By
Z
Z
2Ay = 2By
2Ay = 2By
Z
Z
2Ay = 2By
2Ay = 2By
Z
Z
1Az = 1Bz
2Az = 2Bz
Z
1Az = 1Bz
2Az = 2Bz
Z
1Az = 1Bz
2Az = 2Bz
Z
1Az = 1Bz
2Az = 2Bz
Z
1Az = 1Bz
2Az = 2Bz
Z
1Az = 1Bz
2Az = 2Bz
Z
1Az = 1Bz
2Az = 2Bz
Z
1Az = 1Bz
2Az = 2Bz
Z
5 www.fairchildsemi.com
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