Cypress Semiconductor CY7C139 Şartname Sayfası - Sayfa 5

Bilgisayar Donanımı Cypress Semiconductor CY7C139 için çevrimiçi göz atın veya pdf Şartname Sayfası indirin. Cypress Semiconductor CY7C139 18 sayfaları. 4k x 8/9 dual-port static ram with sem, int, busy

Sayfayı Yazdır
5V
R1 = 893Ω
OUTPUT
C = 30 pF
R2 = 347Ω
(a) Normal Load (Load 1)
OUTPUT
C = 30 pF
Load (Load 2)

Switching Characteristics

Parameter
Description

READ CYCLE

t
Read Cycle Time
RC
t
Address to Data Valid
AA
t
Output Hold From Address Change
OHA
t
CE LOW to Data Valid
ACE
t
OE LOW to Data Valid
DOE
[10,11,12]
t
OE Low to Low Z
LZOE
[10,11,12]
t
OE HIGH to High Z
HZOE
[10,11,12]
t
CE LOW to Low Z
LZCE
[10,11,12]
t
CE HIGH to High Z
HZCE
[12]
t
CE LOW to Power-Up
PU
[12]
t
CE HIGH to Power-Down
PD

WRITE CYCLE

t
Write Cycle Time
WC
t
CE LOW to Write End
SCE
t
Address Set-Up to Write End
AW
t
Address Hold From Write End
HA
t
Address Set-Up to Write Start
SA
t
Write Pulse Width
PWE
t
Data Set-Up to Write End
SD
Note
8. Tested initially and after any design or process changes that may affect these parameters.
Document #: 38-06037 Rev. *D
Figure 2. AC Test Loads and Waveforms
R
= 250Ω
TH
OUTPUT
C = 30pF
(b) Thé venin Equivalent ( Load 1)
ALL INPUT PULSES
3.0V
90%
10%
GND
< 3 ns
[9]
Over the Operating Range
7C138-15
7C139-15
Min
Max
15
15
3
15
10
3
10
3
10
0
15
15
12
12
2
0
12
10
CY7C138, CY7C139
OUTPUT
C = 5 pF
V
= 1.4V
TH
(c) Three-State Delay (Load 3)
90%
10%
< 3 ns
7C138-25
7C138-35
7C139-25
7C139-35
Min
Max
Min
Max
25
35
25
35
3
3
25
35
15
20
3
3
15
20
3
3
15
20
0
0
25
35
25
35
20
30
20
30
2
2
0
0
20
25
15
15
5V
R1 = 893Ω
R2 = 347Ω
7C138-55
7C139-55
Unit
Min
Max
55
ns
55
ns
3
ns
55
ns
25
ns
3
ns
25
ns
3
ns
25
ns
0
ns
55
ns
55
ns
40
ns
40
ns
2
ns
0
ns
30
ns
20
ns
Page 5 of 17
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