參數(shù)資料
型號(hào): SN74ALS232BFN
廠商: Texas Instruments, Inc.
英文描述: LED AMBER DIFFUSED
中文描述: 16】4異步先入先出存儲(chǔ)器
文件頁(yè)數(shù): 6/8頁(yè)
文件大?。?/td> 124K
代理商: SN74ALS232BFN
SN74ALS232B
16
×
4 ASYNCHRONOUS FIRST-IN, FIRST-OUT MEMORY
SCAS251B – FEBRUARY 1989 – REVISED APRIL 1998
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
timing requirements over recommended operating free-air temperature range (see Figure 1)
MIN
NOM
MAX
UNIT
fclock
Clock frequency
LDCK
40
MHz
UNCK
40
RST low
18
LDCK low
15
tw
Pulse duration
LDCK high
10
ns
UNCK low
15
UNCK high
Data before LDCK
LDCK inactive before RST
Data after LDCK
LDCK inactive after RST
10
tsu
Setup time
8
ns
5
th
Hold time
5
5
ns
The maximum possible clock frequency is 40 MHz. The maximum clock frequency when using a 50% duty cycle is 33.3 MHz.
switching characteristics (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
MIN
TYP
MAX
MIN
MAX
UNIT
fmax
LDCK, UNCK
LDCK
UNCK
LDCK
UNCK
RST
LDCK
UNCK
RST
OE
OE
50
40
MHz
td
tpd
Any Q
14
23
6
30
ns
15
23
6
30
tPLH
EMPTY
13
20
5
25
ns
EMPTY
15
22
6
27
tPHL
15
21
5
26
ns
FULL
15
22
6
27
tPLH
FULL
13
20
5
25
ns
16
23
7
28
ten
tdis
Q
5
12
1
14
ns
Q
5
12
1
16
ns
Typical values at VCC – 5 V, TA = 25
°
C.
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