SC28C94 Philips Semiconductors, SC28C94 Datasheet - Page 24

• Manufacturer Part Number: SC28C94
• Description: Quad universal asynchronous receiver/transmitter QUART
• Manufacturer: Philips Semiconductors

1. All voltage measurements are referenced to ground (GND). For testing, all inputs swing between 0.4V and 2.4V with a transition time of 20ns
Philips Semiconductors
AC ELECTRICAL CHARACTERISTICS
V
NOTES:
2. Typical values are at +25
3. Test condition for interrupt and I/O outputs: C
4. Timing is illustrated and referenced to the WRN and RDN inputs. The device may also be operated with CEN as the ‘strobing’ input. CEN
5. The minimum value is not tested, but is guaranteed by design. For t
1998 Aug 19
Reset timing
t
I/O Port timing
t
t
t
Interrupt timing
t
Clock timing
t
t
t
t
f
t
f
t
f
Transmitter timing
t
t
Receiver timing
t
t
CC
SYMBOL
SYMBOL
RES
PS
PH
PD
IR
CLK
CLK
CLK
CTC
CTC
RX
RX
TX
TX
TXD
TCS
RXS
RXH
Quad universal asynchronous receiver/transmitter (QUART)
maximum. For X1/CLK this swing is between 0.4V and 4.4V. All time measurements are referenced at input voltages of V
appropriate.
and RDN (also CEN and WRN) are ANDed internally. As a consequence, the signal asserted last initiates the cycle and the signal negated
first terminates the cycle.
5
5
= 5V
5
5
10%, T
FIGURE
FIGURE
12
12
12
13
14
14
14
14
14
14
14
14
14
15
15
16
16
11
A
= –40_C to 85_C, unless otherwise specified.
Reset pulse width
I/O input setup time before RDN Low
I/O input hold time after RDN High
I/O output valid from
IRQN negated or I/O output High from:
X1/CLK low/high time
X1/CLK low/high time (above 4MHz; X1/CLK
X1/CLK frequency
Counter/timer clock high or low time
Counter/timer clock frequency
RxC high or low time
RxC frequency (16X)
RxC frequency (1X)
TxC high or low time
TxC frequency (16X)
TxC frequency (1X)
TxD output delay from TxC low
TxC output delay from TxD output data
RxD data setup time to RxC high
RxD data hold time from RxC high
Reset command (break change interrupt)
Reset command (I/O change interrupt)
Stop C/T command (counter interrupt)
Read RHR (RxRDY/FFULL interrupt)
Write THR (TxRDY interrupt)
Write IMR (clear of interrupt mask bit)
WRN High (WRN or CEN high, whichever occurs first)
RDN Low (RDN or CEN low, whichever occurs last)
o
C, typical supply voltages, and typical processing parameters.
L
= 50pF, R
1, 2, 3, 4
PARAMETER
PARAMETER
L
= 2.7k to V
24
CLK
2 active)
CC
With respect to a
3.6864MHz clock
on pin X1/CLK
minimum test rate is 2.0MHz.
. Test conditions for rest of outputs: C
125/100
56/56
Min
200
–10
60
30
30
60
60
0
0
0
0
0
0
0
0
LIMITS
3.6864
Typ
L
5
5
= 150pF.
Max
+10
Product specification
8.0
1.0
1.0
40
40
80
80
80
80
80
80
16
16
70
SC28C94
8
IL
and V
IH
UNIT
UNIT
MHz
MHz
MHz
MHz
MHz
MHz
, as
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns