ꢃꢅ-bit �RM Coꢁtex™-Mꢃ MCU
HTꢃꢅF1ꢅ51/51B/5ꢅ/5ꢃ
External Clock Characteristics
Table 8. High Speed External Clock (HSE) Characteristics
T� = ꢅ5°C, unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
High Sꢀeed Exteꢁnaꢂ osciꢂꢂatoꢁ
fꢁequency (HSE)
fHSE
VDDꢃꢃ = ꢃ.ꢃV
4
—
16
MHz
Recommended ꢂoad caꢀacitance on
XT�LIN and XT�LOUT
CHSE
—
—
TBD
1.0
—
—
ꢀF
Recommended exteꢁnaꢂ feedback
ꢁesistoꢁ between XT�LIN and
XT�LOUT
RFHSE
MΩ
DHSE
HSE Osciꢂꢂatoꢁ Duty cycꢂe
40
—
—
—
—
0.96
—
60
—
0.1
4
%
IDDHSE
ISTBHSE
tSUHSE
HSE Osciꢂꢂatoꢁ Oꢀeꢁating Cuꢁꢁent
HSE Osciꢂꢂatoꢁ Standby cuꢁꢁent
HSE Osciꢂꢂatoꢁ Staꢁtuꢀ time
VDDꢃꢃ = ꢃ.ꢃVꢄ T� = ꢅ5°C
VDDꢃꢃ = ꢃ.ꢃVꢄ T� = ꢅ5°C
VDDꢃꢃ = ꢃ.ꢃVꢄ T� = ꢅ5°C
m�
μA
ms
—
Table 9. Low Speed External Clock (LSE) Characteristics
T� = ꢅ5°C, unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
Low Sꢀeed Exteꢁnaꢂ osciꢂꢂatoꢁ
fꢁequency (LSE)
=
fLSE
VDDꢃꢃ = VB�T ꢃ.ꢃV
—
ꢃꢅ.768
—
kHz
Recommended ꢂoad caꢀacitance on
XT�LꢃꢅKIN and XT�LꢃꢅKOUT ꢀins
CLSE
—
—
TBD
—
ꢀF
Recommended exteꢁnaꢂ feedback
ꢁesistoꢁ between XT�LꢃꢅKIN and
XT�LꢃꢅKOUT ꢀins
RFLSE
DLSE
—
—
—
40
—
10
—
—
60
—
MΩ
%
LSE Osciꢂꢂatoꢁ Duty cycꢂe
VDDꢃꢃ = VB�T = ꢃ.ꢃVꢄ
LSESM = 0 (Noꢁmaꢂ
staꢁtuꢀ mode)
IDDLSE
LSE Osciꢂꢂatoꢁ Oꢀeꢁating Cuꢁꢁent
1.7
μA
VDDꢃꢃ = VB�T = ꢃ.ꢃVꢄ
LSESM = 1 (Fast staꢁtuꢀ
mode)
ISTBLSE
LSE Osciꢂꢂatoꢁ Standby cuꢁꢁent
LSE Osciꢂꢂatoꢁ Staꢁtuꢀ time
—
—
ꢃ
8
μA
VDDꢃꢃ = VB�T = ꢃ.ꢃVꢄ
LSESM = 1 (Fast staꢁtuꢀ
mode)
tSULSE
ꢅ00
—
ms
Rev. 1.10
ꢅ4 of ꢃ5
�ꢀꢁiꢂ 1ꢃꢄ ꢅ01ꢅ
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
