saa5250 NXP Semiconductors, saa5250 Datasheet - Page 26

• Manufacturer Part Number: saa5250
• Description: Interface For Data Acquisition And Control For Multi-standard Teletext Systems
• Manufacturer: NXP Semiconductors

Philips Semiconductors
A.C. CHARACTERISTICS
V
C
January 1987
Microcontroller
interface
Cycle time
Address pulse width
RD HIGH or WR to ALE HIGH Fig.11
DS LOW to AS HIGH
ALE LOW to RD
AS LOW to DS HIGH
Write pulse width
Address and chip select
set-up time
Address and chip select hold
time
Read to data out period
Data hold after RD
R/W to DS set-up time
R/W to DS hold time
Data set-up time
Data hold time
Read pulse width
Memory interface
WE LOW to DCK falling edge
WE HIGH to DCK falling edge
MS LOW to DCK rising edge
MS HIGH to DCK rising edge
Address output from DCK
Data output from WE falling
Data hold from WE rising edge
Address set-up time to data
WE pulse width
MS pulse width
DD
L
Interface for data acquisition and control
(for multi-standard teletext systems)
= 50 pF on DB7 to DB0; T
LOW or WR LOW
rising edge
edge
= 5 V 10%; Reference levels for all inputs and outputs, V
PARAMETER
amb
Figs 11 and 12
Fig.12
Fig.11
Fig.12
Fig.12
Fig.12
write cycle
write cycle
note 3
Fig.13
note 4
note 5
note 6
= 0 to 70 = C, unless otherwise specified
CONDITIONS
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
CY
LHLL
AHRD
AHRD
ALRD
ALRD
WL
ASL
AHL
RD
DR
RWS
RWH
DW
WD
RL
WEL
WEH
MSL
MSH
AV
DWL
DWH
AD
WEW
MSW
SYMBOL
26
IH
= 2 V; V
400
50
0
0
30
30
120
10
20
10
40
10
50
10
150 or
DCK 50
10
10
10
10
10
0
0
3 DCK
2 DCK
MIN.
IL
= 0,8 V; V
OH
TYP.
= 2,4 V; V
130
100
80
80
80
85
120
10
3 DCK
110
Product specification
MAX.
OL
= 0,4 V;
SAA5250
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
UNIT