IDT72510, IDT72520
BUS MATCHING BIDIRECTIONAL FIFO
AC ELECTRICAL CHARACTERISTICS
(Commercial: VCC = 5V±10%, TA = 0°C to +70°C)
IDT72510L25
IDT72520L25
Symbol
Parameter
Min.
Max.
PORT B PROCESSOR INTERFACE TIMING
tbA1
Port B access time with
—
25
no parity
tbA2
Port B access time with
—
30
parity
tbLZ
Read or write pulse
LOW to data bus at
Low-Z
5
—
tbHZ
Read or write pulse
HIGH to data bus at
High-Z
—
15
tbDV
Data valid from read
pulse HIGH
5
—
tbRC
Read cycle time
35
—
tbRPW Read pulse width
25
—
tbRR
tbS
tbH
Read recovery time
R/WB set-up time
R/WB hold time
10
—
5
—
5
—
tbDS1
Data set-up time with no
15
—
parity
tbDH1
Data hold time with no
0
—
parity
tbDS2
Data set-up time with
18
—
parity
tbDH2
Data hold time with
parity
0
—
tbWC
Write cycle time
35
—
tbWPW Write pulse width
25
—
tbWR
Write recovery time
10
—
PORT B PERIPHERAL INTERFACE TIMING
tbA1
Port B access time with
—
25
no parity
tbA2
Port B access time with
—
30
parity
tbCKC
Clock cycle time
15
—
tbCKH
Clock pulse HIGH time
6
—
tbCKL
Clock pulse LOW time
6
—
tbREQS Request set-up time
5
—
tbREQH Request hold time
5
—
tbACKL Delay from a rising clock
—
15
edge to ACK switching
Commercial
IDT72510L35
IDT72520L35
Min.
Max.
—
35
—
42
5
—
—
20
5
—
45
—
35
—
10
—
5
—
5
—
18
—
0
—
22
—
0
—
45
—
35
—
10
—
—
40
—
42
20
—
6
—
6
—
5
—
5
—
—
18
COMMERCIAL TEMPERATURE RANGE
IDT72510L50
IDT72520L50
Min.
Max. Unit
Timing
Figure
—
50
ns
13, 14, 15
—
60
ns
13, 14, 15
5
—
ns
13, 14, 15
—
30
ns
13, 14, 15
5
—
ns 13, 14, 15, 16
65
—
ns
13
50
—
ns
13
15
—
ns
13
5
—
ns
13
5
—
ns
13
30
—
ns
13, 14, 15
5
—
ns
13, 14, 15
35
—
ns
13, 14, 15
5
—
ns
13, 14, 15
65
—
ns
13
50
—
ns
13, 15
15
—
ns
13
—
55
ns
17
—
60
ns
17
25
—
ns
17
10
—
ns
17
10
—
ns
17
10
—
ns
17
5
—
ns
17
—
25
ns
17
2669 tbl 24
5.31
19