LPC1776 NXP [NXP Semiconductors], LPC1776 Datasheet - Page 86

• Manufacturer Part Number: LPC1776
• Description: 32-bit ARM Cortex-M3 microcontroller
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
LPC178X_7X
Objective data sheet
11.3 External clock
11.4 Internal oscillators
Table 19.
T
[1]
[2]
Table 20.
T
[1]
[2]
Symbol
f
f
Symbol
f
T
t
t
t
t
osc(RC)
i(RTC)
osc
CHCX
CLCX
CLCH
CHCL
amb
amb
Fig 20. External clock timing (with an amplitude of at least V
cy(clk)
Parameters are valid over operating temperature range unless otherwise specified.
Typical ratings are not guaranteed. The values listed are at room temperature (25 C), nominal supply
voltages.
Parameters are valid over operating temperature range unless otherwise specified.
Typical ratings are not guaranteed. The values listed are at room temperature (25 C), nominal supply
voltages.
=
=


40
40


Dynamic characteristic: external clock
Dynamic characteristic: internal oscillators
C to +85
C to +85
Parameter
internal RC oscillator
frequency
RTC input frequency
Parameter
oscillator frequency
clock cycle time
clock HIGH time
clock LOW time
clock rise time
clock fall time
All information provided in this document is subject to legal disclaimers.


C; V
C; 2.7 V
Rev. 2 — 27 May 2011
DD(3V3)

V
over specified ranges.
DD(3V3)
t
CHCL

3.6 V.
Conditions
-
-
Conditions
t
CLCX
[1]
32-bit ARM Cortex-M3 microcontroller
[1]
T
cy(clk)
Min
1
40
T
T
-
-
Min
11.88
-
t
CLCH
t
cy(clk)
cy(clk)
CHCX
i(RMS)
 0.4
 0.4
LPC178x/7x
= 200 mV)
Typ
12
32.768 -
Typ
-
-
-
-
-
-
002aaa907
© NXP B.V. 2011. All rights reserved.
[2]
[2]
Max
25
1000
-
-
5
5
Max
12.12
86 of 117
Unit
MHz
ns
ns
ns
ns
ns
Unit
MHz
kHz