1 PS8352 04/05/01
Product Description
Pericom Semiconductors PI74ALVCH series of logic circuits are
produced in the Companys advanced 0.5 micron CMOS
technology, achieving industry leading speed.
This 12-bit to 24-bit registered bus exchanger is designed for 2.3V
to 3.6V Vcc operation.
The PI74ALVCH162268 is used for applications in which data
must be transferred from a narrow high-speed bus to a wide, lower
frequency bus.
The device provides synchronous data exchange between the two
ports. Data is stored in the internal registers on the low-to-high
transition of the clock (CLK) input when the appropriate clock
enable (CLKEN) inputs are low. The select (SEL) line is
synchronous with CLK and selects 1B or 2B input data for the A
outputs.
For data transfer in the A-to-B direction, a two stage pipeline is
provided in the A-to-1B path, with a single storage register in the
A-to-2B path. Proper control of these inputs allows two sequential
12-bit words to be presented synchronously as a 24-bit word on the
B-port. Data flow is controlled by the active-low output enables
(OEA, OEB). These control terminals are registered so bus direction
changes are synchronous with CLK.
The B outputs, which are designed to sink up to 12mA, include
equivalent 26Ω resistors to reduce overshoot and undershoot.
To ensure the high-impedance state during power up or power
down, a clock pulse should be applied as soon as possible and OE
should be tied to VCC through a pullup resistor, the minimum value
of the resistor is determined by the current-sinking capability of
the driver. Because OE is being routed through a register, the
active state of the outputs cannot be determined prior to the arrival
of the first clock pulse.
Active bus-hold circuitry is provided to hold unused or floating
data inputs at a valid logic level.
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PI74ALVCH162268
12-Bit To 24-Bit Registered Bus Exchanger
with 3-State Outputs
Product Features
•PI74ALVCH162268 is designed for low voltage operation
VCC = 2.3V to 3.6V
•Hysteresis on all inputs
•Typical VOLP (Output Ground Bounce)
< 0.8V at VCC = 3.3V, TA = 25°C
•Typical VOHV (Output VOH Undershoot)
< 2.0V at VCC = 3.3V, TA = 25°C
•B-port outputs have equivalent 26Ω series resistors,
no external resistors are required.
•Bus Hold retains last active bus state during 3-state
eliminates the need for external pullup resistors
•Industrial operation at 40°C to +85°C
•Packages available:
 56-pin 240 mil wide plastic TSSOP (A56)
 56-pin 300 mil wide plastic SSOP (V56)
Logic Block Diagram
2
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PS8352 04/05/01
PI74ALVCH162268
12-Bit To 24-Bit Registered Bus Exchanger with 3-State Outputs
Pin Name Description
OE Output Enable Input (Active LOW)
CLK Clock
SEL Select (Active Low)
CLKEN Clock Enable (Active Low)
A,1B,2B 3-State Outputs
GND Ground
VCC Power
STUPNISTUPTUO
1ANEKLC2ANEKLCKLCA B1B2
HHXX0B1
)3(
0B2
)3(
LL
↑LL
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X
LL
↑HH
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X
XL
↑LX L
XL
↑HX H
STUPNI stuptuO
A
B1NEKLCB2NEKLCKLCLESB1B2
HXXHXX0A
)3(
XHXLXX0A
)3(
LX↑HLX L
LX↑HHX H
XL↑LXL L
XL↑LXH H
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
25
26
27
28
32
31
30
29
Product Pin Description
Notes:
1. H = High Signal Level, L = Low Signal Level
X = Irrelevant, Z = High Impedance
↑ = Transition, Low to High
2. Two CLK edges are needed to propagate data
3. Output level before the indicated steady state input conditions
were established.
Product Pin Configuration
56-Pin
A, V
OEA
CLKEN1B
2B3
GND
2B2
2B1
VCC
A1
A2
A3
GND
A4
A5
A6
A7
A8
A9
GND
A10
A11
A12
VCC
1B1
1B2
GND
1B3
CLKEN2B
SEL
OEB
CLKENA2
2B4
GND
2B5
2B6
VCC
2B7
2B8
2B9
GND
2B10
2B11
2B12
1B12
1B11
1B10
GND
1B9
1B8
1B7
VCC
1B6
1B5
GND
1B4
CLKENA1
CLK
Truth Tables(1)
A to B STORAGE (OEB = L)
B to A STORAGE (OEA = L)
Output Enable
STUPNISTUPTUO
KLCAEOBEOA B2,B1
↑HHZ Z
↑HLZ evitcA
↑LH evitcAZ
↑LL evitcAevitcA
PI74ALVCH162268
12-Bit To 24-Bit Registered Bus Exchanger with 3-State Outputs
3 PS8352 04/05/01
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Note:
Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the device.
This is a stress rating only and functional operation of the
device at these or any other conditions above those
indicated in the operational sections of this specification
is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect reliability.
DC Electrical Characteristics (Over the Operating Range, TA = 40°C to +85°C, VCC = 3.3V ± 10%)
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
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Storage Temperature .................................................. 65°C to +150°C
Supply Voltage Range, VCC ...........................................0.5V to 4.6V
Input Voltage Range,VI :
Except I/O ports (See Note 1): ........................................ 0.5V to 4.6V
I/O ports (See Notes 1 and 2).............................. 0.5V to VCC + 0.5V
Output Voltage Range, VO (See Notes 1and 2).. 0.5V to VCC + 0.5V
Input Clamp current, IIK (VI < 0) .............................................. 50mA
Output Clamp current, IOK (VO < 0 or VO > VCC)................... ±50mA
Continous Output Current, IO (VO = 0 to VCC) ........................ ±50mA
Continous Current through each VCC or GND ........................±100mA
Maximum Power Dissipation:
A package ................................................................... 1W
V package ................................................................ 1.4W
Notes:
1. The input and output negative-voltage ratings maybe exceeded if the input and outputclamp-current ratings are observed.
2. This value is limited to 4.6V maximum.
3. Unused control inputs must be held HIGH or LOW to prevent them from floating.
4
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PS8352 04/05/01
PI74ALVCH162268
12-Bit To 24-Bit Registered Bus Exchanger with 3-State Outputs
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DC Electrical Characteristics-Continued (Over the Operating Range, TA = -40ºC to +85ºC, VCC = 3.3V ± 10%
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at VCC = 3.3V, +25ºC ambient and maximum loading.
3. Bus hold maximum dynamic current required to switch the input from one state to another
4. For I/O ports, the IOZ includes the input leakage current.
PI74ALVCH162268
12-Bit To 24-Bit Registered Bus Exchanger with 3-State Outputs
5 PS8352 04/05/01
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Timing Requirements over Operating Range
Switching Characteristics over Operating Range(1)
Notes:
1. Unused control inputs must be held HIGH or LOW to prevent them from floating.
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2. Minimum limits are guaranteed but not tested on Propagation Delays.
6
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PS8352 04/05/01
PI74ALVCH162268
12-Bit To 24-Bit Registered Bus Exchanger with 3-State Outputs
Operating Characteristics, TA= 25°C
Pericom Semiconductor Corporation
2380 Bering Drive • San Jose, CA 95131 • 1-800-435-2336 • Fax (408) 435-1100 • http://www.pericom.com
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