AT89C5131A-M Atmel Corporation, AT89C5131A-M Datasheet - Page 164

• Manufacturer Part Number: AT89C5131A-M
• Manufacturer: Atmel Corporation

Specifications of AT89C5131A-M

• Flash (kbytes): 32 Kbytes
• Max. Operating Frequency: 48 MHz
• Cpu: 8051-12C
• Max I/o Pins: 34
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 1
• Twi (i2c): 1
• Uart: 1
• Sram (kbytes): 1.25
• Eeprom (bytes): 1024
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Isp: UART/USB
• Watchdog: Yes

27.4
27.4.1
164
AC Parameters
AT89C5130A/31A-M
Explanation of the AC Symbols
Each timing symbol has 5 characters. The first character is always a “T” (stands for time). The
other characters, depending on their positions, stand for the name of a signal or the logical sta-
tus of that signal. The following is a list of all the characters and what they stand for.
Example:T
T
T
(Load Capacitance for port 0, ALE and PSEN = 60 pF; Load Capacitance for all other outputs =
60 pF.)
Table
Table
Table 27-4, Table 27-7 and
ter for each speed range description. To calculate each AC symbols. take the x value and use
this value in the formula.
Example: T
x = 30 ns
T = 50 ns
T
A
A
CCIV
Symbol
= -40°C to +85°C; V
= -40°C to +85°C; V
V
V
V
V
V
V
REF
IHZ
OH
OL
IH
IL
= 4T - x = 170 ns
T
27-2,
27-3,
LLPL
AVLL
Parameter
USB Reference Voltage
Input High Voltage for D+ and D- (Driven)
Input High Voltage for D+ and D- (Floating)
Input Low Voltage for D+ and D-
Output High Voltage for D+ and D-
Output Low Voltage for D+ and D-
LLIV
= Time for ALE Low to PSEN Low.
Table 27-5
Table 27-7
= Time for Address Valid to ALE Low.
and 20 MHz, Standard clock.
SS
SS
and
and Table 27-9 give for each range the AC parameter.
= 0V; V
= 0V; V
Table 27-8
Table 27-10
CC
CC
= 3.3V ±10%; F = 0 to 48 MHz.
= 3.3V ± 10%.
give the description of each AC symbols.
give the frequency derating formula of the AC parame-
Min
3.0
2.0
2.7
2.8
0.0
Typ
Max
3.6
4.0
3.6
0.8
3.6
0.3
4337K–USB–04/08
Unit
V
V
V
V
V
V