DP83934CVUL20 National Semiconductor, DP83934CVUL20 Datasheet - Page 80

• Manufacturer Part Number: DP83934CVUL20
• Manufacturer: National Semiconductor

Specifications of DP83934CVUL20

• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (min): 4.75V
• Operating Supply Voltage (max): 5.25V
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 160
• Lead Free Status / RoHS Status: Not Compliant

9 0 AC and DC Specifications
MEMORY WRITE BMODE
Note 1 For successive read operations MWR remains high
Note 2 DS will only be asserted if the bus cycle has at least one wait state inserted
Note 3 This setup time assures that the SONIC-T terminates the memory cycle on the next bus clock (BSCK) RDYi does not need to be synchronized to the bus
clock though since it is an asynchronous input in this case RDYi is sampled during the falling edge of BSCK If the SONIC-T samples RDYi low during the T1
cycle the SONIC-T will finish the current access in a total of two bus clocks instead of three which would be the case if RDYi had been sampled low during
T2 (wait) (This is assuming that programmable wait states are set to 0 )
Note 4 One idle clock cycle (Ti) will be inserted between the last write cycle and the following read cycle in RDA and TDA operation Note that the data bus will
become TRI-STATE from the rising edge of the clock after the idle cycle (see T52 for BSCK to data TRI-STATE timing)
Number
T9
T11
T11b
T11d
T12
T12b
T12d
T15
T18
T32a
T33a
T36
T37
T39
BSCK to Address Valid Hold Time
BSCK to ADS Low
BSCK to ECS Low
BSCK to DS Low
BSCK to ADS High
BSCK to ECS High
BSCK to DS High
ADS High Width
Write Data Strobe Low Width (Note 2)
RDYi Asynchronous Setup to BSCK (Note 3)
RDYi Asynchronous Hold from BSCK
BSCK to Memory Write Data Valid Hold Time
(Note 4)
BSCK to MWR (Write) Valid (Note 1)
Write Data Valid to DS Low
e
0 ASYNCHRONOUS MODE
Parameter
(Continued)
80
Min
45
40
34
3
5
5
3
20 MHz
Max
26
26
19
17
24
29
17
50
24
Min
35
30
21
3
4
5
3
25 MHz
TL F 11719 – 62
Max
24
24
17
15
22
27
15
48
22
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns