AT89C55WD Atmel Corporation, AT89C55WD Datasheet - Page 33

• Manufacturer Part Number: AT89C55WD
• Manufacturer: Atmel Corporation

Specifications of AT89C55WD

• Flash (kbytes): 20 Kbytes
• Max. Operating Frequency: 24 MHz
• Cpu: 8051-12C
• Max I/o Pins: 32
• Uart: 1
• Sram (kbytes): 0.25
• Operating Voltage (vcc): 4.0 to 6.0
• Timers: 3
• Watchdog: Yes

39.2
1921D–MICRO–6/08
Notes:
44J – PLCC
R
2325 Orchard Parkway
San Jose, CA 95131
1. This package conforms to JEDEC reference MS-018, Variation AC.
2. Dimensions D1 and E1 do not include mold protrusion.
3. Lead coplanarity is 0.004" (0.102 mm) maximum.
0.51(0.020)MAX
Allowable protrusion is .010"(0.254 mm) per side. Dimension D1
and E1 include mold mismatch and are measured at the extreme
material condition at the upper or lower parting line.
45˚ MAX (3X)
1.14(0.045) X 45˚
B
e
TITLE
44J, 44-lead, Plastic J-leaded Chip Carrier (PLCC)
D1
D
PIN NO. 1
IDENTIFIER
E1
1.14(0.045) X 45˚
E
SYMBOL
D2/E2
A
A1
A2
D
D1
E
E1
B
B1
e
A
17.399
16.510
17.399
16.510
14.986
4.191
2.286
0.660
0.330
0.508
COMMON DIMENSIONS
MIN
B1
(Unit of Measure = mm)
A2
A1
0.318(0.0125)
0.191(0.0075)
1.270 TYP
NOM
–
–
–
–
–
–
–
–
–
–
AT89C55WD
D2/E2
DRAWING NO.
17.653
16.662
17.653
16.662
16.002
4.572
3.048
0.813
0.533
MAX
–
44J
Note 2
Note 2
NOTE
10/04/01
REV.
B
33