PI6C182, PI6C182A
Precision 1-to-10 Clock Buffer
3
PS8165G 11/13/08
Byte1: SDRAM Active/Inactive Reg is ter
(1 = enable, 0 = disable)
Bit Pin Description
7 27 SDRAM7 (Active/Inactive)
6 26 SDRAM6 (Active/Inactive)
5 23 SDRAM5 (Active/Inactive)
4 22 SDRAM4 (Active/Inactive)
3 NC (Initialize to 0)
2 NC (Initialize to 0)
1 NC (Initialize to 0)
0 NC (Initialize to 0)
Byte2: Optional Register for Possible Future
Requirements (1 = enable, 0 = disable)
Bit Pin Description
7 18 SDRAM9 (Active/Inactive)
6 11 SDRAM8 (Active/Inactive)
5 (Reserved)
4 (Reserved)
3 (Reserved)
2 (Reserved)
1 (Reserved)
0 (Reserved)
2-Wire I
2
C Control
The I
2
C interface permits individual enable/disable of each clock
output and test mode enable.
The PI6C182 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.
Each byte on the SDATA line must be 8-bits long (MSB fi rst), fol-
lowed by an acknowledge bit generated by the re ceiver.
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 SDATA while SCLOCK is HIGH indicates a “stop”
condition and in di cates the end of a data transfer cycle.
Each data transfer is initiated with a start condition and ends with
a stop condition. The fi rst 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 ad dressed device). If the de vice’s
own address is detected, PI6C182 gen er ates an ac knowl edge by
pulling SDATA line LOW during ninth clock pulse, then accepts
the fol low ing data bytes until another start or stop con di tion is
detected.
Following acknowledgement of the address byte (D2), two more
bytes must be sent:
1. “Command Code” byte
2. “Byte Count” byte.
Although the data bits on these two bytes are “don’t care,” they
must be sent and acknowledged.
Storage Temperature ............................................................–65°C to +150°C
Ambient Temperature with Power Applied .............................–0°C to +70°C
3.3V Supply Voltage to Ground Potential ..............................–0.5V to +4.6V
DC Input Voltage ....................................................................–0.5V to +4.6V
Note:
Stresses greater than those listed under MAX I MUM RAT-
INGS may cause permanent damage to the de vice. This is
a stress rating only and functional operation of the device
at these or any other con di tions above those indicated in
the operational sec tions of this spec i fi ca tion is not implied.
Ex po sure to absolute maximum rating conditions for ex-
tend ed periods may affect re li abil i ty.
Maximum Ratings
Supply Current
(V
DD
= +3.465V, C
LOAD
= Max.)
Symbol Parameter Test Condidtion Min. Typ. Max. Units
I
DD
Supply Current
BUF_IN = 0 MHz 2
mA
I
DD
BUF_IN = 66.66 MHz 180
I
DD
BUF_IN = 100.00 MHz 240
I
DD
BUF_IN = 133.00 MHz 360
