TS87C54X2-VCB Atmel, TS87C54X2-VCB Datasheet - Page 47

• Manufacturer Part Number: TS87C54X2-VCB
• Description: IC MCU 8BIT 16K OTP 40MHZ 44PLCC
• Manufacturer: Atmel
• Series: 87Cr

Specifications of TS87C54X2-VCB

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 40/30MHz
• Connectivity: UART/USART
• Peripherals: POR, WDT
• Number Of I /o: 32
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: OTP
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 44-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

19.5
19.5.1
4431E–8051–04/06
AC Parameters
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
ranges.
T
T
Table 19-3. gives the maximum applicable load capacitance for Port 0, Port 1, 2 and 3, and ALE
and PSEN signals. Timings will be guaranteed if these capacitances are respected. Higher
capacitance values can be used, but timings will then be degraded.
Table 19-3.
Table 19-5., Table 19-8. and Table 19-11. give the description of each AC symbols.
Table 19-6., Table 19-9. and Table 19-12. give for each range the AC parameter.
Table 19-7., Table 19-10. and Table 19-13. give the frequency derating formula of the AC
parameter. To calculate each AC symbols, take the x value corresponding to the speed grade
you need (-M, -V or -L) and replace this value in the formula. Values of the frequency must be
limited to the corresponding speed grade:
Table 19-4.
Example:
T
A
A
A
A
LLIV
ALE / PSEN
Freq (MHz)
Port 1, 2, 3
= 0 to +70°C (commercial temperature range); V
= 0 to +70°C (commercial temperature range); V
= -40°C to +85°C (industrial temperature range); V
= -40°C to +85°C (industrial temperature range); V
T (ns)
Port 0
in X2 mode for a -V part at 20 MHz (T = 1/20
T
LLPL
AVLL
= Time for ALE Low to PSEN Low.
x= 22 (Table 19-7.)
T= 50ns
T
Load Capacitance versus speed range, in pF
Max frequency for derating formula regarding the speed grade
= Time for Address Valid to ALE Low.
LLIV
-M X1 mode
= 2T - x = 2 x 50 - 22 = 78ns
40
25
100
100
-M
80
-M X2 mode
20
50
-V X1 mode
40
25
E6
SS
SS
= 50 ns):
SS
= 0 V; V
= 0 V; 2.7 V < V
-V
50
50
30
SS
= 0 V; 2.7 V < V
-V X2 mode
= 0 V; V
33.3
30
CC
AT/TS8xC54/8X2
= 5 V ± 10%; -M and -V ranges.
CC
CC <
-L X1 mode
= 5 V ± 10%; -M and -V
CC <
33.3
30
5.5 V; -L range.
5.5 V; -L range.
100
100
80
-L
-L X2 mode
20
50
47