83C748 Datasheet, PDF (6/18 Pages) NXP Semiconductors – 80C51 8-bit microcontroller family 2K/64 OTP/ROM, low pin count

Philips Semiconductors
80C51 8-bit microcontroller family
2K/64 OTP/ROM, low pin count
Preliminary specification
83C748/87C748
AC ELECTRICAL CHARACTERISTICS
T_amb = 0°C to +70°C, V_CC = 5V ±10%, V_SS = 0V^{1, 2}
16MHz CLOCK
VARIABLE CLOCK
SYMBOL
PARAMETER
MIN
MAX
MIN
MAX
UNIT
1/t_CLCL
Oscillator frequency:
3.5
12
MHz
3.5
16
MHz
External Clock (Figure 1)
t_CHCX
High time
20
20
ns
t_CLCX
Low time
20
20
ns
t_CLCH
Rise time
20
20
ns
t_CHCL
Fall time
20
20
ns
NOTES:
1. Parameters are valid over operating temperature range unless otherwise specified. All voltages are with respect to V_SS unless otherwise
noted.
2. Load capacitance for ports = 80pF.
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
L – Logic level low
Q – Output data
T – Time
V – Valid
X – No longer a valid logic level
Z – Float
V_CC –0.5
0.45V
0.2 V_CC + 0.9
0.2 V_CC – 0.1
t_CLCX
t_CHCL
t_CLCL
t_CHCX
t_CLCH
Figure 1. External Clock Drive
SU00297
ROM CODE SUBMISSION
When submitting ROM code for the 83C748, the following must be specified:
1. 2k byte user ROM data
ADDRESS
0000H to 07FFH
CONTENT
DATA
BIT(S)
7:0
COMMENT
User ROM Data
1999 Apr 15
6