PI6C180B Просмотр технического описания (PDF) - Pericom Semiconductor
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PI6C180B Datasheet PDF : 7 Pages
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PI6C180B
Precision 1-18 Clock Buffer
Pin Description
Pin
Symbol
4, 5, 8, 9
SDRAM[0-3]
13, 14, 17, 18 SDRAM[4-7]
31, 32, 35, 36 SDRAM[8-11]
40, 41, 44, 45 SDRAM[12-15]
21, 28
SDRAM[16-17]
11
Buf_IN
38
OE
24
25
3, 7, 12, 16,
20, 29, 33, 37,
42, 46
SDATA
SCLOCK
VDD[0-9]
6, 10, 15, 19,
22, 27, 30, 34, VSS[0-9]
39, 43
23
VDDIIC
26
1, 2, 47, 48
VSSIIC
NC
Type
O
O
O
O
O
I
I
I/O
I/O
Power
Ground
Power
Ground
Reserved
Qty
Description
4 SDRAM Byte 0 clock output
4 SDRAM Byte 1 clock output
4 SDRAM Byte 2 clock output
4 SDRAM Byte 3 clock output
4 SDRAM clock outputs usable for feedback
1 Input for 1-18 buffer
1 Hi-Z all outputs when held LOW. Has a >100kΩ internal pull-up resistor
1 Data pin for I2C circuitry. Has a >100kΩ internal pull-up resistor
1 Clock pin for I2C circuitry. Has a >100kΩ internal pull-ip resistor
10 3.3V power supply for SDRAM buffers
10 Ground for SDRAM buffers
1 3.3V power supply for I2C circuitry
Ground for I2C circuitry
4 Reserved for future modifications. No connects
OE Functionality
OE
SDRAM[0-17]
0
Hi-Z
1
BUF_IN
Notes:
1. Used for test purposes only
2. Buffers are non-inverting
I2C Address Assignment
A6 A5 A4 A3 A2 A1
1
1
0
1
0
0
Notes
1
2
A0 R/W
1
0
Serial Configuration Map
Byte0: SDRAM Active/Inactive Register
(1 = enable, 0 = disable)
Bit Pin
Description
7
18 SDRAM7 (Active/Inactive)
6
17 SDRAM6 (Active/Inactive)
5
14 SDRAM5 (Active/Inactive)
4
13 SDRAM4 (Active/Inactive)
3
9 SDRAM3 (Active/Inactive)
2
8 SDRAM2 (Active/Inactive)
1
5 SDRAM1 (Active/Inactive)
0
4 SDRAM0 (Active/Inactive)
Note:
1. Inactive means outputs are held LOW and are disabled from
switching.
2
PS8468A
07/19/04
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