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ELM621 Datasheet(PDF) 3 Page - ELM Electronics

Part # ELM621
Description  SERIAL THREE BIT PORT
Download  6 Pages
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Manufacturer  ELM [ELM Electronics]
Direct Link  http://www.elmelectronics.com
Logo ELM - ELM Electronics

ELM621 Datasheet(HTML) 3 Page - ELM Electronics

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Elm Electronics – Circuits for the Hobbyist
< http://www.elmelectronics.com/ >
ELM621
Electrical Characteristics
Absolute Maximum Ratings
Storage Temperature....................... -65°C to +150°C
Ambient Temperature with
Power Applied....................................-40°C to +85°C
Voltage on VDD with respect to VSS............ 0 to +7.5V
Voltage on any other pin with
respect to VSS........................... -0.6V to (VDD + 0.6V)
Note:
Stresses beyond those listed here will likely damage
the device. These values are given as a design
guideline only. The ability to operate to these levels
is neither inferred nor recommended.
3 of 6
All values are for operation at 25°C and a 5V supply, unless otherwise noted. For further information, refer to note 1 below.
Characteristic
Minimum
Typical
Maximum
Conditions
Units
Supply Voltage, VDD
4.5
5.0
5.5
V
VDD rate of rise
0.05
V/ms
Average Supply Current, IDD
1.0
2.4
mA
Notes:
1. This integrated circuit is produced with a Microchip Technology Inc.’s PIC12C5XX as the core embedded
microcontroller. For further device specifications, and possibly clarification of those given, please refer to the
appropriate Microchip documentation.
2. This spec must be met in order to ensure that a correct power on reset occurs. It is quite easily achieved
using most common types of supplies, but may be violated if one uses a slowly varying supply voltage, as
may be obtained through direct connection to solar cells, or some charge pump circuits.
3. The value of the internal pullup resistance is both supply and temperature dependent.
4. This specification represents the current flowing through the protection diodes when applying large voltages
to the Rx (pin 5) input through a current limiting resistance. Currents quoted are the maximum continuous.
5. The RS232 baud rate is derived from an internal oscillator that can typically vary by about ±3% over the full
temperature range with VDD = 5V. Data is transferred to and from the ELM621 with 8 data bits, no parity,
and 1 stop bit (8 N 1).
Logical low input voltage
VSS
0.15 VDD
V
VDD
V
0.85 VDD
Output low voltage
0.6
V
Output high voltage
V
VDD - 0.7
Current (sink) = 8.7mA
Current (source) = 5.4mA
see note 2
ELM621DSA
Internal pullup resistances
(see note 3)
500
K
300
600
reset (Pin 4)
Rx pin input current
mA
see note 4
-0.5
B3 (Pin 7) when enabled
K
30
20
50
RS232 Baud Rate
baud
see note 5
9600
+0.5
Logical high input voltage


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