Counter ICs

A Shift Register is a sequential logic device made up of a cascade of flip-flops, through which a sequence of bits are ’shifted’. These devices are commonly used to convert between serial and parallel interfaces.

How it works – basic example

In a Shift Register the output of each flip-flop is connected to the input of the next flip-flop in the cascade. With each cycle of the connected clock, the bits are ’shifted’ down the cascade by one flip-flop.

A simple analogy to understand the basic theory or operation would be to consider a glass tube with an opening both ends, and placing a ball marked ’0’ or ’1’ into one end of the tube at a regular intervals.

As each ball is placed into the tube, all the balls are ’shifted’ along by one position. The sequence in which the balls marked ’0’ and ’1’ where fed in is preserved. Also each time one ball is fed in, the ball that has been in the cascade the longest drops out. So if the tube can contain 4 balls at any one time, this could be described as a 4-bit Shift Register.

Common Types of Shift Register

• Serial-in serial-out (SISO) – In this type of Shift Register, the data input and output is serial. With each clock cycle a new bit is fed into the cascade, with the bit furthest along the cascade exiting as an output. So in a 4-bit register, the output trails the input by 4 clock cycles. This matches the simple example above, with the ball that exits the tube being the output.

• Serial-in parallel-out (SIPO) – In this configuration data is converted from serial into parallel format. As described for the SISO variant above, data is fed in serially and shifted down the cascade, the difference is that each flip-flop has an output, allowing the entire bit array to be output simultaneously as a parallel output. This may be done using a latched of buffered output.

• Parallel-in serial-out (PISO) – This variant takes a parallel input and converts into a serial output. To do this the shift register must implement a write/shift sequence. The parallel data input is (written) into each flip-flop of the array simultaneously in one clock cycle, then for the next cycles the register goes into shift mode as the bits are shifted down the flip-flop cascade, being output as serial data. The process then repeats.

• Parallel-in parallel-out (PIPO) – This type of register differs slightly from the others in that inputs and outputs of each flip-flop in the array are not interconnected. Each flip-flop takes one bit of the parallel input, stores it for a cycle, and then outputs the data simultaneously with the other flip-flops in the register, creating a parallel output that matches the input. Like the SISO type above, PIPO variants can be used to temporarily store data, or act a time delay device.

• Universal Shift Register – A configurable Shift Register that can be programmed to act as a SISO, SIPO, PISO or PIPO device, often on the fly.

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Description Price Package Type Logic Function Number of Stages Logic Family Mounting Type Counter Type Operation Mode Number of Elements Pin Count Minimum Operating Supply Voltage Maximum Operating Supply Voltage Dimensions Length Width
RS庫存編號 662-9206
製造零件編號TPIC6C596PWR
HK$8.864
/個 (每包:5個)
單位
TSSOP Shift Register 8 - Surface Mount - Serial to Serial/Parallel 1 16 4.5 V 5.5 V 5 x 4.4 x 1.15mm 5mm 4.4mm
RS庫存編號 833-462
製造零件編號CD74ACT161M
HK$13.70
單位
SOIC Counter 4 ACT Surface Mount Binary Up Counter 1 16 4.5 V 5.5 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS庫存編號 663-0146
製造零件編號CD74HC194M
HK$2.484
/個 (每包:5個)
單位
SOIC Shift Register 4 HC Surface Mount - Serial/Parallel to Parallel 1 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS庫存編號 709-2122
製造零件編號CD4516BEE4
HK$3.889
/個 (每包:10個)
單位
PDIP Counter 4 4000 Through Hole Binary Down Counter, Up Counter 1 16 3 V 18 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 816-8722
製造零件編號74LV595PW,112
BrandNexperia
HK$6.249
/個 (每包:8個)
單位
TSSOP Shift Register 8 74LV Surface Mount - Serial to Serial/Parallel 1 16 1 V 3.6 V 5.1 x 4.5 x 0.95mm 5.1mm 4.5mm
RS庫存編號 162-7302
製造零件編號SN65HVS882PWP
HK$38.48
毎管:50 個
單位
- - - - - - - - - - - - - -
RS庫存編號 806-1678
製造零件編號MC74HCT4094ADR2G
HK$1.025
Each (On a Tape of 50)
單位
SOIC Shift Register 8 MC74 Surface Mount - Serial 1 16 4.5 V 5.5 V 10 x 4 x 1.5mm 10mm 4mm
RS庫存編號 662-8130
製造零件編號SN74HC166DR
HK$2.87
/個 (每包:10個)
單位
SOIC Shift Register 8 HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS庫存編號 865-2066
製造零件編號74HC594D,112
BrandNexperia
HK$5.047
/個 (每包:10個)
單位
SOIC Shift Register 8 74HC Surface Mount - Serial to Parallel Converter 1 16 2 V 6 V 10 x 4 x 1.45mm 10mm 4mm
RS庫存編號 186-9097
製造零件編號MC74HCT595ADTG
HK$3.113
毎管:96 個
單位
TSSOP Shift Register 8 HCT Surface Mount - Serial to Parallel - 16 4.5 V dc 5.5 V dc 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm
RS庫存編號 740-5623
製造零件編號NJU3730R-TE1
HK$36.34
單位
VSP Shift Register - - Surface Mount - Serial to Parallel 1 8 2.4 V 5.5 V 2.9 x 2.8 x 1.1mm 2.9mm 2.8mm
RS庫存編號 152-5531
製造零件編號74AHC594PW,118
BrandNexperia
HK$3.348
/個 (每包:25個)
單位
TSSOP Shift Register 8 74AH Surface Mount - Serial to Parallel 1 16 2 V 5.5 V 5.1 x 4.5 x 0.95mm 5.1mm 4.5mm
RS庫存編號 162-6688
製造零件編號SN74LV8153PW
HK$13.141
毎管:70 個
單位
TSSOP - 8 74LV Surface Mount - Serial to Parallel 1 20 3 V 13.2 V 6.6 x 4.5 x 1.05mm 6.6mm 6.6mm
RS庫存編號 436-7717
製造零件編號74HCT4094D,112
BrandNexperia
HK$3.601
毎管:50 個
單位
SOIC Shift Register 8 HCT Surface Mount - Serial to Serial/Parallel 1 16 4.5 V 5.5 V 10 x 4 x 1.45mm 10mm 4mm
RS庫存編號 162-7551
製造零件編號TPIC6B596DWR
HK$4.75
個 (在毎卷:2000)
單位
SOIC Shift Register 8 - Surface Mount - Serial to Serial/Parallel 1 20 4.5 V 5.5 V 12.8 x 7.52 x 2.35mm 12.8mm 7.52mm
RS庫存編號 178-9178
製造零件編號CD74HC390M
HK$5.66
毎管:40 個
單位
SOIC Counter, Divider 4 HC Surface Mount Decade Up Counter 2 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS庫存編號 178-9161
製造零件編號CD74HC390M96
HK$5.281
毎管:40 個
單位
SOIC Counter, Divider 4 HC Surface Mount Decade Up Counter 2 16 2 V 6 V 9.9 x 3.91 x 1.58mm 9.9mm 3.91mm
RS庫存編號 709-2914
製造零件編號CD74HC597EE4
HK$7.512
/個 (每包:10個)
單位
PDIP Shift Register 8 HC Through Hole - Serial to Serial/Parallel 1 16 2 V 6 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 145-0146
製造零件編號CD74ACT164E
HK$5.754
毎管:25 個
單位
PDIP Shift Register 8 ACT Through Hole - Serial to Parallel 1 14 4.5 V 5.5 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm
RS庫存編號 170-7970
製造零件編號74HC4094D,653
BrandNexperia
HK$1.12
個 (在毎卷:2500)
單位
SO - 8 74HC Surface Mount - Serial to Serial/Parallel 1 16 2 V 6 V 10 x 4 x 1.45mm 10mm 4mm