PI74LPT16543 Datasheet, PDF (1/5 Pages) Pericom Semiconductor Corporation – Fast CMOS 16-Bit Latched Transceivers

PI74LPT16543
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Fast CMOS 16-Bit Latched Transceivers ¹
Product Features
• Compatible with LCX™ and LVT™ families of products
• Supports 5V Tolerant Mixed Signal Mode Operation
– Input can be 3V or 5V
– Output can be 3V or connected to 5V bus
• Advanced Low Power CMOS Operation
• Excellent output drive capability:
Balanced drives (24 mA sink and source)
• Pin compatible with industry standard double-density
pinouts
• Low ground bounce outputs
• Hysteresis on all inputs
• Industrial operating temperature range: –40°C to +85°C
• Multiple center pins and distributed Vcc/GND pins
minimize switching noise
• Packages available:
– 56-pin 240 mil wide plastic TSSOP (A)
– 56-pin 300 mil wide plastic SSOP (V)
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Product Description
Pericom Semiconductor’s PI74LPT series of logic circuits are pro-
duced in the Company’s advanced 0.6 micron CMOS technology,
achieving industry leading speed grades.
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The PI74LPT16543 is 16-bit latched transceivers organized with
two sets of eight D-type latches with separate input and output
controls for each set. For data flow from A to B, for example, the A-
4 ^{to-B Enable (xCEAB) input must be LOW in order to enter data}
from xAx or to take data from xBx, as indicated in the Truth Table.
With xCEAB LOW, a LOW signal makes the A-to-B latches
5 ^{transparent; a subsequent LOW-to-HIGH transition of the xLEAB}
signal puts the A latches in the storage mode and their outputs no
longer change the A inputs. With xCEAB and xOEAB both LOW,
the 3-state B output buffers are active and reflect the data present at
6 ^{the output of the A latches. Control of data from B to A is similar,}
but uses the xCEAB, xLEAB, and xOEAB inputs.
The PI74LPT16543 can be driven from either 3.3V or 5.0V devices
allowing this device to be used as a translator in a mixed 3.3/5.0V
system.
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Logic Block Diagram
1OEBA
1CEBA
1LEBA
1OEAB
1CEAB
1LEAB
C
1A0
D
C
D
TO 7 OTHER CHANNELS
2OEBA
2CEBA
2LEBA
2OEAB
2CEAB
2LEAB
1B0
2A0
C
D
C
D
TO 7 OTHER CHANNELS
8
9
10
11
12
2B0
13
14
15
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PS2072A 01/16/97