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SN74ACT7814-40DL Datasheet(PDF) 1 Page - Texas Instruments

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Part # SN74ACT7814-40DL
Description  64 x 18 STROBED FIRST-IN, FIRST-OUT MEMORY
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

SN74ACT7814-40DL Datasheet(HTML) 1 Page - Texas Instruments

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SN74ACT7814
64
× 18 STROBED FIRST-IN, FIRST-OUT MEMORY
SCAS209C – APRIL 1992 – REVISED APRIL 1998
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D Member of the Texas Instruments
Widebus
™ Family
D Load Clock and Unload Clock Can Be
Asynchronous or Coincident
D 64 Words by 18 Bits
D Low-Power Advanced CMOS Technology
D Full, Empty, and Half-Full Flags
D Programmable Almost-Full/Almost-Empty
Flag
D Fast Access Times of 15 ns With a 50-pF
Load and All Data Outputs Switching
Simultaneously
D Data Rates up to 50 MHz
D 3-State Outputs
D Pin-to-Pin Compatible With SN74ACT7804
and SN74ACT7806
D Packaged in Shrink Small-Outline 300-mil
Package Using 25-mil Center-to-Center
Spacing
description
A FIFO memory is a storage device that allows
data to be written into and read from its array at
independent data rates. The SN74ACT7814 is a
64-word by 18-bit FIFO for high speed and fast
access times. It processes data at rates up to
50 MHz and access times of 15 ns in a bit-parallel
format.
Data is written into memory on a low-to-high
transition at the load clock (LDCK) input and is
read out on a low-to-high transition at the unload
clock (UNCK) input. The memory is full when the
number of words clocked in exceeds the number
of words clocked out by 64. When the memory is
full, LDCK signals have no effect on the data
residing in memory. When the memory is empty,
UNCK signals have no effect.
Status of the FIFO memory is monitored by the full (FULL), empty (EMPTY), half-full (HF), and
almost-full/almost-empty (AF/AE) flags. The FULL output is low when the memory is full and high when the
memory is not full. The EMPTY output is low when the memory is empty and high when it is not empty. The HF
output is high when the FIFO contains 32 or more words and is low when it contains 31 or fewer words. The
AF/AE status flag is a programmable flag. The first one or two low-to-high transitions of LDCK after reset are
used to program the almost-empty offset value (X) and the almost-full offset value (Y) if program enable (PEN)
is low. The AF/AE flag is high when the FIFO contains X or fewer words or (64 – Y) or more words. The AF/AE
flag is low when the FIFO contains between (X + 1) and (63 – Y) words.
Copyright
© 1998, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Widebus is a trademark of Texas Instruments Incorporated.
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RESET
D17
D16
D15
D14
D13
D12
D11
D10
VCC
D9
D8
GND
D7
D6
D5
D4
D3
D2
D1
D0
HF
PEN
AF/AE
LDCK
NC
NC
FULL
OE
Q17
Q16
Q15
GND
Q14
VCC
Q13
Q12
Q11
Q10
Q9
GND
Q8
Q7
Q6
Q5
VCC
Q4
Q3
Q2
GND
Q1
Q0
UNCK
NC
NC
EMPTY
DL PACKAGE
(TOP VIEW)


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