IDT72125 Ver la hoja de datos (PDF) - Integrated Device Technology
Número de pieza
componentes Descripción
Fabricante
IDT72125 Datasheet PDF : 12 Pages
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IDT72105, IDT72115, IDT72125,
256 x 16, 512 x 16, 1024 x 16 PARALLEL-TO-SERIAL CMOS FIFO
PIN CONFIGURATION
COMMERCIAL TEMPERATURE RANGES
W
D0
D1
D2
D3
D4
D5
D6
D7
EF
FF
HF
RSIX
GND
1
28
2
27
3
26
4
25
5
24
6
23
P28-2
7 SO28-3 22
8
21
9
20
10
19
11
18
12
17
13
16
14
15
DIP/SOIC
TOP VIEW
Vcc
D 15
D 14
D 13
D 12
D 11
D 10
D9
D8
RS
SO
SOCP
RSOX/AEF
FL/DIR
2665 drw 02a
PIN DESCRIPTIONS
Symbol
Name
I/O
Description
D0–D15
RS
W
SOCP
FL/DIR
Inputs
Reset
Write
Serial Output
Clock
First Load/
Direction
I Data inputs for 16-bit wide data.
I When RS is set low, internal READ and WRITE pointers are set to the first location of the RAM
array. FF and HF go HIGH. EF and AEF go LOW. A reset is required before an initial WRITE
after power-up. W must be high during the RS cycle. Also the First Load pin (FL) is programmed
only during Reset.
I A write cycle is initiated on the falling edge of WRITE if the Full Flag (FF) is not set. Data set-up
and hold times must be adhered to with respect to the rising edge of WRITE. Data is stored in the
RAM array sequentially and independently of any ongoing read operation.
I A serial bit read cycle is initiated on the rising edge of SOCP if the Empty Flag (EF) is not set. In
both Depth and Serial Word Width Expansion modes, all of the SOCP pins are tied together.
I This is a dual purpose input used in the width and depth expansion configurations. The First
Load ( FL) function is programmed only during Reset (RS) and a LOW on FL indicates the first
device to be loaded with a byte of data. All other devices should be programmed HIGH. The
Direction (DIR) pin controls shift direction after Reset and tells the device whether to read out the
Least Significant or Most Significant bit first.
RSIX
Read Serial In I In the single device configuration, RSIX is set HIGH. In depth expansion or daisy chain
Expansion
expansion, RSIX is connected to RSOX (expansion out) of the previous device.
SO
Serial Output O Serial data is output on the Serial Output (SO) pin. Data is clocked out LSB or MSB depending
on the Direction pin programming. During Expansion the SO pins are tied together.
FF
Full Flag
O When FF goes LOW, the device is full and further WRITE operations are inhibited. When FF is
HIGH, the device is not full.
EF
Empty Flag
O When EF goes LOW, the device is empty and further READ operations are inhibited. When EF is
HIGH, the device is not empty.
HF
Half-Full Flag O When HF is LOW, the device is more than half-full. When HF is HIGH, the device is empty to
half-full.
RSOX/AEF Read Serial
O This is a dual purpose output. In the single device configuration (RSIX HIGH), this is an AEF
Out Expansion
output pin. When AEF is LOW, the device is empty-to-(1/8 full -1) or (7/8 full +1)-to-full. When
Almost-Empty,
AEF is HIGH, the device is 1/8-full up to 7/8-full. In the Expansion configuration (RSOX
Almost-Full
connected to RSIX of the next device) a pulse is sent from RSOX to RSIX to coordinate the
Flag
width, depth or daisy chain expansion.
VCC
Power Supply
Single power supply of 5V.
GND
Ground
Single ground of 0V.
2665 tbl 01
5.35
2
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