SC28C94 Philips Semiconductors, SC28C94 Datasheet - Page 25

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

1. Parameters are valid over specified temperature range. See ordering information table for applicable temperature range and operating
Philips Semiconductors
AC ELECTRICAL CHARACTERISTICS
V
NOTES:
2. Timing is illustrated and referenced to the WRN and RDN inputs. The device may also be operated with CEN as a ‘strobing’ input. CEN and
3. The RDN signal must be negated for this time to guarantee that internal registers update before the next read.
1998 Aug 19
CC
Quad universal asynchronous receiver/transmitter (QUART)
NO
NO.
supply range.
RDN (also CEN and WRN) are ANDed internally. As a consequence the signal asserted last initiates the cycle; the signal negated first
terminates the cycle. Address is latched at leading edge of a read or write cycle.
10
1
2
3
4
5
6
7
8
9
= 5V
A[5:0]
D[7:0]
WRN
CEN
RDN
FIGURE
FIGURE
10%, T
5
5
5
5
5
5
5
5
5
5
A
= –40_C to 85_C, unless otherwise specified.
A[5:0] Setup time to RDN WRN Low
A[5:0] Hold time from RDN WRN Low
CEN Setup time to RDN WRN Low
CEN Hold time from RDN WRN High
RDN WRN Pulse Width Low
D[7:0] Data Valid after CEN and RDN Low
D[7:0] Data Bus floating after RDN or CEN High
D[7:0] Data Bus Setup time before WRN or CEN High
D[7:0] Hold time after WRN or CEN High
Time between Reads and/or Writes
1
3
2
Figure 5. A Read Cycle Followed by a Write Cycle without DACKN
6
5
CHARACTERISTIC
CHARACTERISTIC
1
READ CYCLE
2
3
2
4
7
25
10
1
2
WRITE CYCLE
Min
45
65
20
5
0
0
0
5
0
8
LIMITS
Typ
9
Max
Product specification
SC28C94
65
10
SD00164
UNIT
UNIT
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns