Hln6837E Astro Spectra Plus Voltage Conversion Block Schematic - Motorola ASTRO Digital Spectra Plus Detailed Service Manual

7-80
VOCON TO COMMAND
TX-RS232_2.85 I
CTS-RS232_2.85 I
LH-TX_DATA_2.85 I
BUSY_OUT_2.85 I
I
LH_RESETO_2.85
MOSIA_2.85 I
QSCKA_2.85 I
ROSC-PSC_EN_2.85 I
SYN_SEL_2.85 I
DA_SEL*_2.85 I
DISP_EN-LATCH_2.85 I
SPKR_EN_2.85 I
TXPA_EN*_2.85 I
I
K9_4EN-MIC_EN_2.85
5V_EN*_2.85 I
VIPOUT1-BL_EN_2.85 I
I
VIPOUT2_2.85
RESET_OUT_2.85 I
ENCRYPTION 2.85V FROM/TO BRAVO
SSI_SEC_CLK_2.85V I
MOSI_SEC_2.85V I
MISO_SEC_2.85V O
ENCRYPTION TO SECURE
SS#_3 I
COMMAND TO VOCON
RX-RS232_2.85 O
O
RTS-RS232_2.85
LH-RX_DATA_2.85 O
BUSY_RTS_2.85 O
LH_RESETI_2.85 O
O
LOCK_DET_2.85
O
VIP_IN2_2.85
VIP_IN1_2.85 O
EMER_2.85 O
INT_PTT_2.85 O

HLN6837E ASTRO Spectra Plus Voltage Conversion Block Schematic

September 5, 2008
VCC5.0
VCC2.85
C500
0.1uF
R500
2K
1
EN_OE1
19
EN_OE2
U500
MC74VHCT244A
2 18
A0 Y0
4 16
A1 Y1
6 14
A2 Y2
8 12
A3 Y3
11 9
A4 Y4
13 7
A5 Y5
15 5
A6 Y6
17 3
A7 Y7
VCC5.0
1
EN_OE1
19
EN_OE2
U501
MC74VHCT244A
2 18
A0 Y0
4 16
A1 Y1
6 14
A2 Y2
8 12
A3 Y3
11 9
A4 Y4
13 7
A5 Y5
15 5
A6 Y6
17 3
A7 Y7
VCC5.0
C502
0.1uF
1
EN_OE1
19
EN_OE2
U502
MC74VHCT244A
2 18
A0
Y0
4 16
A1 Y1
6 14
A2
Y2
8 12
A3 Y3
11 9
A4
Y4
13 7
A5 Y5
15 5
A6
Y6
17 3
A7 Y7
Schematics, Component Location Diagrams and Parts Lists: ASTRO Spectra Plus VOCON Section
C501
0.1uF
C503
0.1uF
VCC2.85
C504
0.1uF
1
EN_OE1
19
EN_OE2
U504
MC74LCX244
18 2
Y0 A0
16 4
Y1 A1
14 6
Y2 A2
12 8
Y3 A3
9 11
Y4 A4
7 13
Y5 A5
5 15
Y6 A6
3 17
Y7 A7
ENCRYPTION 5V TO/FROM SECURE
VCC2.85
1
EN_OE1
19
EN_OE2
U503
MC74LCX244
18 2
Y0 A0
16 4
Y1 A1
14 6
Y2 A2
12 8
Y3 A3
9 11
Y4 A4
7 13
Y5 A5
5 15
Y6 A6
3 17
Y7 A7
TO CONNECTOR
O TX-RS232_5
O CTS-RS232_5
O LH-TX_DATA_5
O BUSY_OUT_5
O
LH_RESETO_5
O MOSIA_5
O QSCKA_5
O ROSC-PSC_EN_5
O
SYN_SEL_5
O
DA_SEL*_5
O DISP_EN-LATCH*_5
O SPKR_EN_5
O TXPA_EN*_5
O K9_4EN-MIC_EN_5
O 5V_EN*_5
O VIPOUT1-BL_EN_5
O VIPOUT2_5
O
RESET_OUT_5
O MOSI_SEC_5
O
SSI_SEC_CLK_5V
O SS#_5
I MISO_SEC_5
FROM CONNECTOR
I RX-RS232_5
I RTS-RS232_5
I LH-RX_DATA_5
I
BUSY_RTS_5
I LH_RESETI_5
I LOCK_DET_5
I VIP_IN2_5
I VIP_IN1_5
I EMER_5
I INT_PTT_5
6881076C25-E