80C31 Datasheet, PDF (13/30 Pages) NXP Semiconductors – CMOS single-chip 8-bit microcontrollers

Philips Semiconductors
CMOS single-chip 8-bit microcontrollers
Product specification
80C31/80C51/87C51
AC ELECTRICAL CHARACTERISTICS FOR SC87C51 12–33MHz PHILIPS NORTH AMERICA DEVICES
T_amb = 0°C to +70°C or –40°C to +85°C, V_CC = 5V ±10%, V_SS = 0V (SC87C51 12, 16 and 24MHz versions);
For SC87C51 (33MHz only) T_amb = = 0°C to +70°C, V_CC = 5V ±5%
VARIABLE CLOCK³
SYMBOL FIGURE
PARAMETER
MIN
MAX
UNIT
1/t_CLCL
Oscillator frequency:
SC87C51
Speed Versions
C
G
P
Y
3.5
12
MHz
3.5
16
MHz
3.5
24
MHz
3.5
33
MHz
t_LHLL
1
t_AVLL
1
t_LLAX
1
t_LLIV
1
t_LLPL
1
t_PLPH
1
t_PLIV
1
t_PXIX
1
t_PXIZ
1
t_AVIV
1
t_PLAZ
1
Data Memory
ALE pulse width
Address valid to ALE low
Address hold after ALE low
ALE low to valid instruction in
ALE low to PSEN low
PSEN pulse width
PSEN low to valid instruction in
Input instruction hold after PSEN
Input instruction float after PSEN
Address to valid instruction in
PSEN low to address float
2t_CLCL–40
ns
t_CLCL–13
ns
t_CLCL–20
ns
4t_CLCL–65
ns
t_CLCL–13
ns
3t_CLCL–20
ns
3t_CLCL–45
ns
0
ns
t_CLCL–10
ns
5t_CLCL–55
ns
10
ns
t_RLRH
2, 3
t_WLWH
2, 3
t_RLDV
2, 3
t_RHDX
2, 3
t_RHDZ
2, 3
t_LLDV
2, 3
t_AVDV
2, 3
t_LLWL
2, 3
t_AVWL
2, 3
t_QVWX
2, 3
t_WHQX
2, 3
t_RLAZ
2, 3
t_WHLH
2, 3
External Clock
RD pulse width
WR pulse width
RD low to valid data in
Data hold after RD
Data float after RD
ALE low to valid data in
Address to valid data in
ALE low to RD or WR low
Address valid to WR low or RD low
Data valid to WR transition
Data hold after WR
RD low to address float
RD or WR high to ALE high
6t_CLCL–100
ns
6t_CLCL–100
ns
5t_CLCL–90
ns
0
ns
2t_CLCL–28
ns
8t_CLCL–150
ns
9t_CLCL–165
ns
3t_CLCL–50
3t_CLCL+50
ns
4t_CLCL–75
ns
t_CLCL–20
ns
t_CLCL–20
ns
0
ns
t_CLCL–20
t_CLCL+25
ns
t_CHCX
5
High time
12
ns
t_CLCX
5
Low time
12
ns
t_CLCH
5
Rise time
20
ns
t_CHCL
5
Fall time
20
ns
NOTES:
1. Parameters are valid over operating temperature range unless otherwise specified.
2. Load capacitance for port 0, ALE, and PSEN = 100pF, load capacitance for all other outputs = 80pF.
3. For all Philips North America speed versions only.
4. Interfacing the 87C51 to devices with float times up to 50ns is permitted. This limited bus contention will not cause damage to port 0 drivers.
1996 Aug 16
13