IDT72511/IDT72521
BIDIRECTIONAL FIRST-IN FIRST-OUT MEMORY
MILITARY AND COMMERCIAL TEMPERATURE RANGES
AC ELECTRICAL CHARACTERISTICS
(Commercial: VCC = 5V ± 10%, TA = 0°C to + 70°C; Military: VCC = 5V ± 10%, TA = –55°C to + 125°C)
Commercial
Military
Com'l & Mil.(1)
Symbol
Parameter
IDT72511L25 IDT72511L35
IDT72511L50
IDT72521L25 IDT72521L35 IDT72521L40 IDT72521L50
Min. Max. Min. Max. Min. Max. Min. Max. Unit
PORT B PROCESSOR INTERFACE TIMING
tbA
Port B access time
—
25
—
35
—
40
—
50
ns
tbLZ
Read or write pulse
LOW to data bus at
Low-Z
5
—
5
—
5
—
5
—
ns
tbHZ
Read or write pulse
HIGH to data bus at
High-Z
—
15
—
20
—
25
—
30
ns
tbDV
Data valid from read
pulse HIGH
5
—
5
—
5
—
5
—
ns
tbRC
Read cycle time
35
—
45
—
50
—
65
—
ns
tbRPW
tbRR
tbS
tbH
Read pulse width
Read recovery time
R/WB set-up time
R/WB hold time
25
—
35
—
40
—
50
—
ns
10
—
10
—
10
—
15
—
ns
5
—
5
—
5
—
5
—
ns
5
—
5
—
5
—
5
—
ns
tbDS
Data set-up time
15
—
18
—
20
—
30
—
ns
tbDH
tbWC
Data hold time
Write cycle time
0
—
2
—
5
—
5
—
ns
35
—
45
—
50
—
65
—
ns
tbWPW Write pulse width
25
—
35
—
40
—
50
—
ns
tbWR
Write recovery time
10
—
10
—
10
—
15
—
ns
PORT B PERIPHERAL INTERFACE TIMING
tbA
tbCKC
Port B access time
Clock cycle time
—
25
—
40
—
45
—
55
ns
15
—
20
—
20
—
25
—
ns
tbCKH
Clock pulse HIGH time
6
—
6
—
8
—
10
—
ns
tbCKL
Clock pulse LOW time
6
—
6
—
8
—
10
—
ns
tbREQS Request set-up time
5
—
5
—
5
—
10
—
ns
tbREQH Request hold time
5
—
5
—
5
—
5
—
ns
tbACKL Delay from a rising clock —
15
—
18
—
20
—
25
ns
edge to ACK switching
NOTE:
1. IDT72511 not available in military.
Timing
Figure
13, 14, 15
13, 14, 15
14, 13, 15
13, 14, 15, 16
13
13
13
13
13
13, 14, 15
13, 14, 15
13
13, 15
13
17
17
17
17
17
17
17
2668 tbl 22
5.32
16