PI74ALVTC16652
2.5V 16-Bit Bus Transceiver and
Register with 3-State Outputs
Product Features
ProductDescription
PI74ALVTC16652isdesignedforlowvoltageoperation,
Pericom Semiconductors PI74ALVTC series of logic circuits are
produced using the Companys advanced 0.35 micron CMOS
technology, achieving industry leading speed.
V
DD
=1.65Vto3.6V
Supports Live Insertion
ThePI74ALVTC16652isa16-bitbustransceiverandregisterdesigned
forlow1.65V to3.6VVccoperation.ItconsistsofD-typeflip-flops
and control circuitry arranged for multiplexed transmission of data
directly from the data bus or from the internal storage registers. The
devicecanbeusedastwo8-bittransceiversorone16-bittransceiver.
3.6V I/O Tolerant Inputs and Outputs
Bus Hold
HighDrive,32/64mA@3.3V
Uses patented noise reduction circuitry
Power-off high impedance inputs and outputs
Industrial operation at 40°C to +85°C
Packagesavailable:
Complementary Output Enable (OEAB and OEBA) inputs are
provided to control the transceiver functions. Select Control (SAB
and SBA) inputs are provided to select whether real-time or stored
dataistransferred.Alowinputlevelselectsreal-timedata,andahigh
input level selects stored data. Circuitry used for Select Control
eliminates the typical decoding glitch that occurs in a multiplexer
during the transition between stored and real-time data.
56-pin240-milwideplasticTSSOP(A56)
56-pin173-milwideplasticTVSOP(K56)
LogicBlockDiagram
Data on the A or B bus, or both, can be stored in the internal D flip-
flopsbylow-to-hightransitionsattheappropriateclock(CLKABor
CLKBA) inputs regardless of the levels on the Select Control or
Output Enable inputs. When SAB and SBA are in the real-time
transfer mode, it also is possible to store data without using the
internal D-type flip-lops by simultaneously enabling OEAB and
OEBA. Inthisconfiguration, eachoutputreinforcesitsinput. Thus,
whenallotherdatasourcestothetwosetsofbuslinesareinthehigh-
impedance state, each set of bus lines remains at its last level
configuration.
56
1OEBA
1
1OEAB
55
1CLKBA
54
1SBA
2
1CLKAB
3
1SAB
One of Eight Channels
1D
C1
Toensurethehigh-impedancestateduringpoweruporpowerdown,
OEBA should be tied to Vcc through a pull-up resistor and OEAB
should be tied to GND through a pull-down resistor; the minimum
value of the resistor is determined by the current-sinking current
sourcing capability of the driver.
5
1A1
52
1B1
1D
C1
The family offers both I/O Tolerant, which allows it to operate in
mixed 1.65/3.6V systems, and Bus Hold, which retains the data
inputs last state preventing floating inputs and eliminating the
need for pullup/down resistors.
TO SEVEN OTHER CHANNELS
29
2OEBA
28
30
2OEAB
2CLKBA
31
27
2SBA
2CLKAB
26
2SAB
One of Eight Channels
1D
C1
15
2A1
42
2B1
1D
C1
TO SEVEN OTHER CHANNELS
PS8597
01/22/02
1