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.(4)
Symbol
Parameter
IDT72511L25 IDT72511L35
IDT72511L50
IDT72521L25 IDT72521L35 IDT72521L40 IDT72521L50
Min. Max. Min. Max. Min. Max. Min. Max. Unit
Timing
Figure
PORT B RETRANSMIT TIMING
tbDSBH
RER, REW, LDRER,
LDREW set-up and
recovery time
10
—
10
—
10
—
15
—
ns
9, 18
PROGRAMMABLE I/O TIMING
tPIOA
Programmable I/O
access time
—
20
—
25
—
25
—
30
ns
19
tPIOS
Programmable I/O set-
8
—
10
—
10
—
15
—
ns
19
up time
tPIOH
Programmable I/O hold
8
—
10
—
10
—
15
—
ns
19
time
BYPASS TIMING
tBYA
Bypass access time
—
18
—
20
—
25
—
30
ns
16
tBYD
Bypass delay
—
10
—
15
—
20
—
20
ns
16
taBYDV Bypass data valid time
15
—
15
—
15
—
15
—
ns
16
from DSA
tbBYDV (3) Bypass data valid time
3
—
3
—
3
—
3
—
ns
16
from DSB
FLAG TIMING (1) (2)
tREF
Read clock edge to
Empty Flag asserted
—
25
—
35
—
40
—
45
ns 14, 15, 20, 22
tWEF
Write clock edge to
—
25
—
35
—
40
—
45
ns 14, 15, 20, 22
Empty Flag not asserted
tRFF
Read clock edge to Full —
25
—
35
—
40
—
45
ns 14, 15, 21, 23
Flag not asserted
tWFF
Write clock edge to Full
—
25
—
35
—
40
—
45
ns 14, 15, 21, 23
Flag asserted
tRAEF
Read clock edge to
Almost-Empty Flag
asserted
—
40
—
50
—
55
—
60
ns
20, 22
tWAEF
Write clock edge to
—
40
—
50
—
55
—
60
ns
Almost-Empty Flag not
asserted
20, 22
tRAFF
Read clock edge to
Almost-Full Flag not
asserted
—
40
—
50
—
55
—
60
ns
21, 23
tWAFF
Write clock edge to
Almost-Full Flag
asserted
—
40
—
50
—
55
—
60
ns
21, 23
NOTES:
1. Read and write are internal signals derived from DSA, R/WA, DSB, R/WB, RB, and WB.
2668 tbl 23
2. Although the flags, Empty, Almost-Empty, Almost-Full, and Full Flags are internal flags, the timing given is for those assigned to external pins.
3. Values guaranteed by design, not currently tested.
4. IDT72511 not available in military.
5.32
17