70T3339S200BC IDT, 70T3339S200BC Datasheet - Page 18

• Manufacturer Part Number: 70T3339S200BC
• Description: SRAM
• Manufacturer: IDT

Specifications of 70T3339S200BC

• Part # Aliases: IDT70T3339S200BC

Timing Waveform of Write with Address Counter Advance
(Flow-through or Pipelined Inputs)
Timing Waveform of Counter Repeat
NOTES:
1. CE
2. CE
3. The "Internal Address" is equal to the "External Address" when ADS = V
4. Addresses do not have to be accessed sequentially since ADS = V
5. Output state (High, Low, or High-impedance) is determined by the previous cycle control signals.
6. No dead cycle exists during REPEAT operation. A READ or WRITE cycle may be coincidental with the counter REPEAT cycle: Address loaded by last valid
7. CNTEN = V
IDT70T3339/19/99S
High-Speed 2.5V 512/256/128K x 18 Dual-Port Static RAM
use only.
ADS load will be accessed. Extra cycles are shown here simply for clarification. For more information on REPEAT function refer to Truth Table II.
written to during this cycle.
0
0
, UB, LB, and R/W = V
, UB, LB = V
ADDRESS
INTERNAL
ADDRESS
ADDRESS
INTERNAL
ADDRESS
DATA
REPEAT
DATA
CNTEN
DATA
CNTEN
IL
ADS
CLK
R/
CLK
ADS
OUT
advances Internal Address from ‘An’ to ‘An +1’. The transition shown indicates the time required for the counter to advance. The ‘An +1’Address is
W
IN
IN
IL
(3)
; CE
(3)
(5)
1
= V
t
Ax
SRPT
IL
t
t
IH
t
; CE
SA
SAD
SD
.
t
An
Dn
EXTERNAL
HRPT
ADDRESS
t
1
t
t
WRITE
CH2
t
HAD
EXECUTE
HD
HA
REPEAT
and REPEAT = V
t
CH2
t
CYC2
t
CYC2
t
CL2
An
t
t
SAD
SCN
t
t
(6)
t
SW
SD
CL2
(7)
t
SCN
D
Dn + 1
t
0
t
HCN
t
HAD
t
HW
HD
LAST ADS LOAD
WITH COUNTER
IH
t
N
LAST ADS
ADDRESS
HC
.
WRITE
WRITE
IL
Dn + 1
constantly loads the address on the rising edge of the CLK; numbers are for reference
COUNTER HOLD
LAST ADS
ADDRESS
An + 1
IL
(1)
READ
and equals the counter output when ADS = V
6.42
WRITE
18
(2)
Dn + 2
ADDRESS + 1
LAST ADS
LAST ADS +1
READ
An + 2
Industrial and Commercial Temperature Ranges
t
SA
Q
An
LAST
t
Dn + 3
HA
ADDRESS n
WRITE WITH COUNTER
READ
An
An + 3
IH
(4)
An + 1
Q
.
LAST+1
ADDRESS n+1
Dn + 4
READ
An + 1
An + 4
5652 drw 18
5652 drw 17
An + 2
Qn
,
,