83C748 Philips Semiconductors, 83C748 Datasheet - Page 6

• Manufacturer Part Number: 83C748
• Description: 80C51 8-bit microcontroller family 2K/64 OTP/ROM/ low pin count
• Manufacturer: Philips Semiconductors

1. Parameters are valid over operating temperature range unless otherwise specified. All voltages are with respect to V
2. Load capacitance for ports = 80pF.
Philips Semiconductors
AC ELECTRICAL CHARACTERISTICS
T
NOTES:
EXPLANATION OF THE AC SYMBOLS
Each timing symbol has five characters. The first character is always
‘t’ (= time). The other characters, depending on their positions,
indicate the name of a signal or the logical status of that signal. The
designations are:
C – Clock
D – Input data
H – Logic level high
ROM CODE SUBMISSION
When submitting ROM code for the 83C748, the following must be specified:
1. 2k byte user ROM data
1999 Apr 15
amb
1/t
External Clock (Figure 1)
t
t
t
t
CHCX
CLCX
CLCH
CHCL
SYMBOL
80C51 8-bit microcontroller family
2K/64 OTP/ROM, low pin count
ADDRESS
0000H to 07FFH
noted.
CLCL
= 0 C to +70 C, V
Oscillator frequency:
High time
Low time
Rise time
Fall time
CC
V
CC
= 5V 10%, V
0.45V
–0.5
PARAMETER
CONTENT
DATA
SS
= 0V
0.2 V
0.2 V
1, 2
CC
CC
– 0.1
+ 0.9
Figure 1. External Clock Drive
t
CHCL
t
6
CLCX
BIT(S)
7:0
L – Logic level low
Q – Output data
T – Time
V – Valid
X – No longer a valid logic level
Z – Float
MIN
16MHz CLOCK
20
20
t
CLCL
t
CLCH
t
CHCX
MAX
20
20
VARIABLE CLOCK
MIN
3.5
3.5
20
20
SU00297
COMMENT
User ROM Data
83C748/87C748
SS
Preliminary specification
MAX
12
16
20
20
unless otherwise
UNIT
MHz
MHz
ns
ns
ns
ns