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SN74V245-EP データシート(PDF) 3 Page - Texas Instruments

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部品番号 SN74V245-EP
部品情報  DSP-SYNC FIRST-IN, FIRST-OUT MEMORY
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI1 - Texas Instruments

SN74V245-EP データシート(HTML) 3 Page - Texas Instruments

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PAG PACKAGE
(TOP VIEW)
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Q14
Q13
GND
Q12
Q11
VCC
Q10
Q9
GND
Q8
Q7
Q6
Q5
GND
Q4
VCC
1
2
3
4
5
6
7
8
9
10
11
12
13
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SN74V245-EP
www.ti.com
SCAS932A – DECEMBER 2012 – REVISED JANUARY 2013
DEVICE INFORMATION
TERMINAL FUNCTIONS
TERMINAL
I/O
DESCRIPTION
NAME
NO.
D0–D17
1-16, 63, 64
I
Data inputs. Data inputs for an 18-bit bus.
Memory-empty/valid-data-available flag. In the standard mode, the EF function is selected.
EF/OR
54
O
EF indicates whether the FIFO memory is empty. In FWFT mode, the OR function is
selected. OR indicates whether there is valid data available at the outputs.
Memory-full/space-available flag. In the standard mode, the FF function is selected. FF
FF/IR
25
O
indicates whether the FIFO memory is full. In the FWFT mode, the IR function is selected. IR
indicates whether there is space available for writing to the FIFO memory.
Mode selection. In the single-device or width-expansion configuration, FL, together with WXI
and RXI, determines if the mode is standard mode or first-word fall-through (FWFT) mode,
FL
18
I
as well as whether the PAE/PAF flags are synchronous or asynchronous (see Table 5). In
the daisy-chain depth-expansion configuration, FL is grounded on the first device (first-load
device) and set to high for all other devices in the daisy chain.
30, 35, 40, 46, 51,
GND
Ground
55, 62
Read/write control. When LD is low, data on the inputs D0–D11 is written to the offset and
depth registers on the low-to-high transition of the WCLK, when WEN is low. When LD is
LD
59
I
low, data on the outputs Q0–Q11 is read from the offset and depth registers on the low-to-
high transition of RCLK when REN is low.
Output enable. When OE is low, the data output bus is active. If OE is high, the output data
OE
58
I
bus is in the high-impedance state.
Programable almost-empty flag. When PAE is low, the FIFO is almost empty, based on the
PAE
17
O
offset programmed into the FIFO. The default offset at reset is 127 from empty.
Programable almost-full flag. When PAF is low, the FIFO is almost full, based on the offset
PAF
23
O
programmed into the FIFO. The default offset at reset is 127 from full.
Copyright © 2012–2013, Texas Instruments Incorporated
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