PI6C180B 查看數據表（PDF） - Pericom Semiconductor
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PI6C180B Datasheet PDF : 7 Pages
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PI6C180B
Precision 1-18 Clock Buffer
2-Wire I2C Control
The I2C interface permits individual enable/disable of each clock
output and test mode enable.
The PI6C180B is a slave receiver device. It can not be read back.
Sub addressing is not supported. All preceding bytes must be sent
in order to change one of the control bytes.
Every bite put on the SDATAline must be 8-bits long (MSB first), fol-
lowed by an acknowledge bit generated by the receiving device.
During normal data transfers SDATA changes only when SCLOCK
is LOW. Exceptions: A HIGH to LOW transition on SDATA while
SCLOCK is HIGH indicates a “start” condition. A LOW to HIGH
transition on SDATAwhile SCLOCK is HIGH is a “stop” condition
and indicates the end of a data transfer cycle.
Each data transfer is initiated with a start condition and ended with
a stop condition. The first byte after a start condition is always a
7-bit address byte followed by a read/write bit. (HIGH = read from
addressed device, LOW= write to addressed device). If the device’s
own address is detected, PI6C180B generates an acknowledge by
pulling SDATA line LOW during ninth clock pulse, then accepts
the following data bytes until another start or stop condition is
detected.
Following acknowledgement of the address byte (D2), two more
bytes must be sent:
1. “Command Code” byte, and
2. “Byte Count” byte.
Although the data bits on these two bytes are “don’t care,” they
must be sent and acknowledged.
Byte1: SDRAM Active/Inactive Register
(1 = enable, 0 = disable)
Bit Pin
Description
7
45 SDRAM15 (Active/Inactive)
6
44 SDRAM14 (Active/Inactive)
5
41 SDRAM13 (Active/Inactive)
4
40 SDRAM12 (Active/Inactive)
3
36 SDRAM11 (Active/Inactive)
2
35 SDRAM10 (Active/Inactive)
1
32 SDRAM9 (Active/Inactive)
0
31 SDRAM8 (Active/Inactive)
Byte2: Optional Register for Possible Future
Requirements (1 = enable, 0 = disable)
Bit Pin
Description
7
28 SDRAM17 (Active/Inactive)
6
21 SDRAM16 (Active/Inactive)
5
(Reserved)
4
(Reserved)
3
(Reserved)
2
(Reserved)
1
(Reserved)
0
(Reserved)
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Storage Temperature................................................. –65°C to +150°C
Note:
Stresses greater than those listed under MAXIMUM
Ambient Temperature with Power Applied .................. –0°C to +70°C
3.3V Supply Voltage to Ground Potential ...................–0.5V to +4.6V
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 con-
DC Input Voltage .........................................................–0.5V to +4.6V
ditions above those indicated in the operational
sections of this specification is not implied. Exposure to ab-
solute maximum rating conditions for extended periods may
affect reliability.
Supply Current (VDD = +3.465V, CLOAD = Max.)
Symbol
Parameter
IDD
IDD
Supply Current
IDD
Test Condidtion
BUF_IN = 0 MHz
BUF_IN = 66.66 MHz
BUF_IN = 100.00 MHz
Min. Typ. Max. Units
2
230
mA
360
3
PS8468A
07/19/04
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