DS87C550-QCL+ Maxim Integrated Products, DS87C550-QCL+ Datasheet - Page 38

• Manufacturer Part Number: DS87C550-QCL+
• Description: IC MCU EPROM ADC/PWM HS 68-PLCC
• Manufacturer: Maxim Integrated Products
• Series: 87Cr

Specifications of DS87C550-QCL+

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 33MHz
• Connectivity: EBI/EMI, SIO, UART/USART
• Peripherals: Power-Fail Reset, PWM, WDT
• Number Of I /o: 55
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: OTP
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 6x10b
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 68-LCC, 68-PLCC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

MOVX CHARACTERISTICS
NOTES FOR MOVX CHARACTERISTICS USING STRETCH MEMORY CYCLES
§
§
PARAMETER
Data Access ALE Pulse
Width
Port 0 Address Valid to
ALE Low
Address Hold after
ALE Low for MOVX
Write
Valid Data In
Data Hold
after Read
Data Float
after Read
ALE Low to
Valid Data In
Port 0 Address
to Valid Data In
Port 2 Address
to Valid Data In
ALE Low to RD
or WR Low
Port 0 Address to RD
or WR Low
Port 2 Address to RD
or WR Low
Data Valid to
Data Hold
after Write
Float
to ALE High
RD Pulse Width
RD Low to
RD Low to Address
RD or WR High
WR Pulse Width
WR Transition
t
for each Stretch selection.
C
MCS
ST
is the stretch cycle value as determined by the MD2, MD1, & MD0 bits of the CKCON register.
is a time period related to the Stretch memory cycle selection. The following table shows the value of t
SYMBOL
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
AVWL1
AVWL2
t
WLWH
AVDV1
AVDV2
LHLL2
AVLL2
LLAX2
QVWX
WHQX
WHLH
RLDV
RHDX
RHDZ
LLWL
RLRH
LLDV
RLAZ
0.125t
C
C
0.375t
0.125t
0.125t
1.25t
0.25t
1.25t
0.25t
0.25t
1.25t
1.5t
0.25t
0.25t
0.5t
2.5t
0.5t
2.5t
0.25t
1.5t
0.25t
0.5t
0.5t
0.5t
0.5t
ST
ST
MIN
*t
*t
-10
MCS
MCS
MCS
MCS
MCS
MCS
-5
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
0
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
-10
-12
-12
-12
-12
-10
-5
-10
-5
-5
-10
-10
-12
-12
-5
-10
-10
-10
38 of 49
VARIABLE CLOCK
-5
-5
-10
-5
-5
-5
-5
-5
(C
(C
(C
(C
(C
(C
-((0.125 t
ST
ST
ST
ST
ST
ST
0.625t
0.875t
C
0.125t
1.25t
1.25t
0.75t
0.25t
0.25t
+0.25)*t
+1.25)*t
0.5t
0.25t
1.5t
+0.5)*t
+1.5)*t
+0.5)*t
+1.5)*t
0.5t
ST
MAX
*t
MCS
MCS
18
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
MCS
-20
-15
+10
+10
MCS
MCS
MCS
MCS
-5
-40
-20
+5
+5
MCS
MCS
-5
-25
-20
+5
)-5)
-27
-20
-20
-20
-40
-40
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
VALUES C
STRETCH
1<=C
4<=C
1<=C
4<=C
1<=C
1<=C
1<=C
1<=C
4<=C
1<=C
4<=C
1<=C
4<=C
1<=C
4<=C
1<=C
4<=C
1<=C
4<=C
1<=C
4<=C
1<=C
4<=C
1<=C
4<=C
(MD2:0)
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
C
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
=0
=0
>0
=0
=0
=0
=0
=0
=0
=0
=0
=0
=0
=0
=0
=0
<=3
<=7
<=3
<=7
<=7
<=7
<=7
<=3
<=7
<=3
<=7
<=3
<=7
<=3
<=7
<=3
<=7
<=3
<=7
<=3
<=7
<=3
<=7
<=3
<=7
ST
MCS