Philips Semiconductors Product data sheet
SC28L198Octal UART for 3.3 V and 5 V supply voltage
2006 Aug 10
43
AC ELECTRICAL CHARACTERISTICS FOR COMMERCIAL AND INDUSTRIAL (5V)
V
CC
= 5.0 volts 10%; T
A
= –40 °C to +85°C; unless otherwise specified
SYMBOL FIG # PARAMETER LIMIT UNIT
MIN TYP MAX
Reset Timing
t
RES
1
RESET pulse width 10 Sclk
Bus Timing
t
AS
A0–A7 setup time before Sclk C3 rising edge 10 2 ns
t
AH
A0–A7 hold time after Sclk C3 rising edge 18 8 ns
t
CS
CEN setup time before Sclk C1 high (Sync) 5 3 ns
CEN setup time before Sclk C2 high (Async) 5 3 ns
t
CH
CEN hold time after Sclk C3 high (Sync) 14
1½Sclk
ns
CEN hold time after Sclk C4 high (Async) 25
1½Sclk
ns
t
STP
CEN high before next C2 to stop next cycle (Sync Mode)
2
18 ns
t
RWS
W–Rn setup time before Sclk C2 rising edge 5 ns
t
RWH
W–Rn hold time after Sclk C3 rising edge 14
1½Sclk
ns
t
DD
Read cycle Data valid after Sclk C3 rising edge 12 25 ns
t
DF
Read cycle data bus floating after CEN high (Sync) 10 16 ns
Read cycle data bus floating after C4 end high (Async) 10 15 ns
t
DS
Write cycle data setup time before Sclk C4 rising edge 25 14 ns
t
DH
Write cycle data hold time after Sclk C4 rising edge 15 8 ns
t
RWD
High time between CEN low (Async) 12
½ Sclk
ns
I/O Port Pin Timing
t
PS
I/O input setup time before Sclk C3 rising edge 18 4 ns
t
PH
I/O input hold time after Sclk C4 rising edge 12 1 ns
t
PD
I/O output valid from:
Write Sclk C4 rising edge (write to IOPIOR)
32 50 ns
Interrupt Timing
t
IR
IRQN from:
Internal interrupt source active bid
Reset to IRQN inactive
Write IMR (set or clear IMR bit)
3
22 26 43
75
45
Sclk
ns
ns
t
DD
IACKN cycle Data valid after Sclk C3 rising edge 12 25 ns
Tx/Rx Clock Timing
t
RX
RxC high or low time 15 8 ns
F
RX
4
RxC frequency (16 X)
(1 X)
0
0
16
1
Mhz
Mhz
t
TX
TxC high or low time 15 7 ns
F
TX
4
TxC frequency (16 X)
(1 X)
0
0
16
1
Mhz
Mhz
Transmitter Timing
t
TXD
TxD output delay from TxC low 32 60 ns
ttcs TxC output delay from TxD output data –15 4 15 ns
Receiver Timing
t
RXS
RxD data setup time to RxC high (data) 20 –4 ns
t
RXH
RxD data hold time from RxC high (data) 20 6 ns
ts
STRT
RxD data low time for receiving a valid Start Bit 17/32 bit
time