PI74SSTVF16857
14-Bit Registered Buffer
Product Features
ProductDescription
• PI74SSTVF16857isdesignedforlow-voltageoperation,
2.5VforPC1600~PC2700;2.6VforPC3200
• Supports SSTL_2 Class I output specifications
• SSTL_2 Input and Output Levels
PericomSemiconductor’sPI74SSTVF16857 seriesoflogiccircuits
are produced using the Company’s advanced sub-micron CMOS
technology, achieving industry leading speed.
The 14-bit PI74SSTVF16857 universal bus driver is designed
• Designed for DDR Memory
• Flow-Through Architecture
• PackagingOptions(Pb-freeavailable):
–48-pin240milwideplasticTSSOP(A)
–48-pin173milwideplasticTVSOP(K)
for2.5Vto2.6VV operation and SSTL_2 I/O Levels except for
DD
theRESETinputwhichisLVCMOS.
Data flowfrom DtoQiscontrolledbythe differential clock, CLK,
CLK and RESET. Data is triggered on the positive edge of CLK.
CLK must be used to maintain noise margins.
LogicBlockDiagram
RESET must be supported with LVCMOS levels as V
may not
REF
bestableduringpower-up.RESETisasynchronousandisintended
forpower-uponlyandwhenlowassuresthatalloftheregistersreset
totheLowState,Qoutputsarelow,andallinputreceivers,dataand
clock, are switched off.
38
CLK
39
CLK
34
RESET
R
1
CLK
Q1
48
35
Pericom’s PI74SSTVF16857 is characterized for operation from
0°to70°C.
D1
D
V
REF
ProductPinConfiguration
TO 13 OTHER CHANNELS
Q1
Q2
1
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
D1
ProductPinDescription
2
D2
PinName
RESET
CLK
CLK
D
Description
GND
3
GND
Reset (Active Low)
Clock Input
Clock Input
V
4
V
DDQ
Q3
DD
5
D3
Q4
Q5
6
D4
Data Input
7
D5
Q
Data Output
GND
8
D6
GND
Ground
V
V
9
D7
DDQ
Q6
48-Pin
A,K
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
V
Core Supply Voltage
Output Supply Voltage
Input Reference Voltage
CLK
CLK
DD
Q7
V
V
DDQ
V
DDQ
GND
DD
REF
GND
TruthTable(1)
Q8
Q9
V
REF
Inputs
Outputs
RESET
D8
RESET
CLK
CLK
D
X
H
L
Q
L
H
L
Qo(2)
V
V
DDQ
GND
D9
L
H
X
↑
X
↓
Q10
Q11
Q12
D10
D11
D12
Η
↑
↓
H
L or H
L or H
X
V
DDQ
GND
DD
Notes:
GND
D13
D14
2. Output level before the
indicated steady state
input conditions were
established.
1. H = HighSignalLevel
L = LowSignalLevel
Q13
Q14
↑
↓
= TransitionLOW-to-HIGH
=TransitionHIGH-to-LOW
X = Irrelevant
PS8656A
05/27/03
1