27963 Parallax Inc, 27963 Datasheet - Page 3

• Manufacturer Part Number: 27963
• Description: SOLUTIONS CUBED: MEMKEY
• Manufacturer: Parallax Inc

Specifications of 27963

• Accessory Type: Keypad Encoder
• Product: Microcontroller Accessories
• For Use With/related Products: BASIC Stamp®
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Miniature Engineering Modules – MEMKey
SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
note: These are stress ratings only. Stresses above those listed below may cause permanent damage and/or affect device reliability.
used to determine applicable ranges of operation.
Storage Temperature
Operating Temperature
Supply Voltage
Voltage on any pin
DC ELECTRICAL CHARACTERISTICS
At T
note: “Typ” values are for design guidance only and are not guaranteed.
SOLUTIONS CUBED
530-891-8045
Characteristi
c
Supply Voltage
VDD rise time
to ensure good
reset
Supply Current
FM Input Low
Voltage
FM Input High
Voltage
FM Input Weak
Pull Up current
TM Output
Low Voltage
TM Output High
Voltage
TM Output Pull
Up current
KEYpin Output
Low Voltage
KEY pin Output
High Voltage
KEY pin Output
current
KEY pin
impedance
A
= 25°C and VDD = 5.0V unless otherwise noted.
Symbol
VOLTM
VIHTM
VOHA
IFMPU
ITMPU
VOLA
SVdd
VDD
VIH
VIL
Icc
Ar
IA
-65°C to +125°C
-20°C to +80°C
0 to 7.0V
-0.6V to (VDD+0.6V)
0.2VDD+1
VDD-0.7
GND
VDD
Min
0.05
3.0
2.0
2.5
50
V
Typ
250
270
3.5
5.0
0.2VDD
Max
VDD
18.5
400
5.5
6.0
0.6
5.5
0.6
V/ms
Unit
mA
mA
mA
V
V
V
V
V
V
V
A
Notes
If this is not met, the
MEMKey may start
up in an unknown
state.
KEY inactive, no
communication.
Writing EEPROM
adds 3mA.
4.0<VDD<5.0
Full VDD range
User may use better
of two specs.
VFM = GND
Min value is at VDD
Min, while Max value
is at VDD max.
TM is open collector
TM open collector is
tied to VDD with a
5% 1k
KEY pin has a 270
output impedance
KEY pin has a 270
output impedance
KEY shorted to
ground
There is a series 5%
270 ohm resistor in
line with the KEY
output.
resistor.
The operational ratings should be
2