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87C749 Datasheet(PDF) 13 Page - NXP Semiconductors

Part # 87C749
Description  80C51 8-bit microcontroller family 2K/64 OTP/ROM, 5 channel 8-bit A/D, PWM, low pin count
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

87C749 Datasheet(HTML) 13 Page - NXP Semiconductors

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Philips Semiconductors
Preliminary specification
83C749/87C749
80C51 8-bit microcontroller family
2K/64 OTP/ROM, 5 channel 8-bit A/D, PWM, low pin count
1998 Apr 23
13
DC ELECTRICAL CHARACTERISTICS (Continued)
Tamb = 0°C to +70°C, AVCC = 5V ±5, AVSS = 0V4
VCC = 5V ± 10%, VSS = 0V
TEST
LIMITS4
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP1
MAX
UNIT
Analog Inputs (A/D guaranteed only with quartz window covered.) (Continued)
R
Resolution
8
bits
ERA
Relative accuracy
±1
LSB
OSe
Zero scale offset
±1
LSB
Ge
Full scale gain error
0.4
%
MCTC
Channel to channel matching
±1
LSB
Ct
Crosstalk
0–100kHz
–60
dB
NOTES:
1. Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and
functional operation of the device at these or any conditions other than those described in the AC and DC Electrical Characteristics section
of this specification is not implied.
2. Under steady state (non-transient) conditions, IOL must be externally limited as follows:
Maximum IOL per port pin:
10mA
(NOTE: This is 85
°C spec.)
Maximum IOL per 8-bit port:
26mA
Maximum total IOL for all outputs:
67mA
If IOL exceeds the test condition, VOL may exceed the related specification. Pins are not guaranteed to sink current greater than the listed
test conditions.
3. This product includes circuitry specifically designed for the protection of its internal devices from the damaging effects of excessive static
charge. Nonetheless, it is suggested that conventional precautions be taken to avoid applying greater than the rated maxima.
4. Parameters are valid over operating temperature range unless otherwise specified. All voltages are with respect to VSS unless otherwise
noted.
5. Power-down ICC is measured with all output pins disconnected; port 0 = VCC; X2, X1 n.c.; RST = VSS.
6. ICC is measured with all output pins disconnected; X1 driven with tCLCH, tCHCL = 5ns, VIL = VSS + 0.5V, VIH = VCC – 0.5V; X2 n.c.;
RST = port 0 = VCC. ICC will be slightly higher if a crystal oscillator is used.
7. Idle ICC is measured with all output pins disconnected; X1 driven with tCLCH, tCHCL = 5ns, VIL = VSS + 0.5V, VIH = VCC – 0.5V; X2 n.c.;
port 0 = VCC; RST = VSS.
8. Load capacitance for ports = 80pF.
9. The resistor ladder network is not disconnected in the power down or idle modes. Thus, to conserve power, the user may remove AVCC.
10. If the A/D function is not required, or if the A/D function is only needed periodically, AVCC may be removed without affecting the operation of
the digital circuitry. Contents of ADCON and ADAT are not guaranteed to be valid. If AVCC is removed, the A/D inputs must be lowered to
less than 0.5V. Digital inputs on P1.0–P1.4 will not function normally.
11. These parameters do not apply to P1.0–P1.4 if the A/D function is enabled.
AC ELECTRICAL CHARACTERISTICS
Tamb = 0°C to +70°C or –40°C to +85°C, VCC = 5V ±10%, VSS = 0V4, 8
16MHz CLOCK
VARIABLE CLOCK
SYMBOL
PARAMETER
MIN
MAX
MIN
MAX
UNIT
1/tCLCL
Oscillator frequency:
3.5
16
MHz
External Clock (Figure 4)
tCHCX
High time
20
20
ns
tCLCX
Low time
20
20
ns
tCLCH
Rise time
20
20
ns
tCHCL
Fall time
20
20
ns


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