CC256X Datasheet, PDF (31/51 Pages) Texas Instruments – Bluetooth® Smart Ready Controller

CC256x
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4.1.5 nSHUTD Requirements
SWRS121C – JULY 2012 – REVISED OCTOBER 2013
Operation mode level ⁽¹⁾
Shutdown mode level ⁽¹⁾
Parameter
Minimum time for nSHUT_DOWN low to reset the device
Sym
V_IH
V_IL
Min
1.42
0
5
Max
1.98
0.4
Unit
V
V
ms
Rise and fall times
t_r and t_f
20
μs
(1) An internal 300-kΩ pulldown retains shut-down mode when no external signal is applied to this pin.
4.1.6 Slow Clock Requirements
Characteristics
Input slow clock frequency
Input slow clock accuracy
(Initial + temp + aging)
Input transition time t_r and t_f (10% to
90%)
Frequency input duty cycle
Slow clock input voltage limits
Condition
Bluetooth
ANT
Square wave, DC-coupled
Input impedance
Input capacitance
Sym
t_r and t_f
V_IH
V_IL
Min
15%
0.65 ×
VDD_IO
0
1
Typ
32768
50%
Max
±250
±50
200
85%
VDD_IO
0.35 ×
VDD_IO
5
Unit
Hz
ppm
ns
V peak
V peak
MΩ
pF
4.1.7 External Fast Clock Crystal Requirements and Operation
Characteristics
Supported crystal frequencies
Frequency accuracy
(Initial + temperature + aging)
Crystal oscillator negative resistance
Condition
26 MHz, external capacitance = 8 pF
I_osc = 0.5 mA
26 MHz, external capacitance = 20 pF
I_osc = 2.2 mA
Sym
f_in
4.1.8 Fast Clock Source Requirements (–40°C to +85°C)
Characteristics
Condition
Sym
Supported frequencies
Reference frequency accuracy
Initial + temp + aging
F_REF
Fast clock input voltage limits Square wave, DC-coupled
V_IL
V_IH
Sine wave, AC-coupled
Sine wave, DC-coupled
Sine wave input limits, DC-coupled
Fast clock input rise time
(as % of clock period)
Square wave, DC-coupled
Duty cycle
Phase noise for 26 MHz
@ offset = 1 kHz
@ offset = 10 kHz
@ offset = 100 kHz
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Min
650
490
Min
–0.2
1.0
0.4
0.4
0
35%
Typ
Max
Unit
26
MHz
±20
ppm
940
Ω
710
Typ
Max
Unit
26
MHz
±20
ppm
0.37
V
2.1
V
1.6
V_p-p
1.6
V_p-p
1.6
V
10%
50%
65%
–123.4
–133.4
–138.4
dBc/Hz
Device Specifications
31